Here are possible answers to why Charlie’s t-shirt ‘puffed up and outward’ after the shot...and why his neck wound looks to be an ‘exit wound’ because of its size... 

1. Charlie’s t-shirt ‘puffing up’ after the (palm pistol) round impacts his neck. Here’s AI data that explains the Shock and Pressure Physics that likely blew  his shirt outward and ‘puffed it up' briefly.

2.  First, some say the observed wound is too large to be an Entry Wound.  Wrong.   Here are the physics explaining how Charlie’s neck wound was as large as it was...

AI Overview

Yes, a gunshot entry wound can be large, especially if the bullet deforms, fragments, explodes or yaws upon impact
.  A wound is also larger in close-range or if the bullet first strikes an intermediate object. Under typical circumstances, entry wounds are smaller than the bullet's diameter due to the skin's elasticity, which makes large entry wounds significant indicators of the shot's unique circumstances. 


Factors that lead to a large entry wound

- Bullet fragmentation or deformation: Bullets that break apart (frangible), explode, or deform (like hollow-point rounds, which ‘mushroom' on impact) can create a larger entry wound.
 
- Body location: The elasticity and density of the tissue struck can influence the size of the wound. 

What a standard entry wound looks like

A ‘typical' or distant-range entry wound is often smaller than the bullet's actual diameter and appears as a relatively neat, roundish defect in the skin. The skin's elasticity allows it to stretch and then recoil around the hole, making the entry point small.  
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AI Overview

Yes, a gunshot entry wound can be large due to the pressure wave (shockwave) and expanding gases from the firearm , although this is dependent on the type of weapon and ammunition, and is not the most common result.  The size and appearance of a gunshot entry wound can be influenced by several factors:

- Bullet deformation: Expanding, exploding or fragmenting ammunition, such as hollow-point bullets, can cause more damage and a larger wound cavity upon impact because of the increase in the bullet's surface area.

- High velocity: For very high-velocity bullets, the entrance wound can be larger than the bullet's diameter. The high energy of these projectiles is more likely to cause extensive temporary cavitation and tissue damage.

- Yaw and tumble: After entering the body, a bullet may begin to wobble, or "yaw," and tumble. This increases the surface area presented to the tissue, causing greater energy transfer and more damage.

The role of cavitation and shockwaves

The phenomena of cavitation and shockwaves are distinct but related aspects of bullet ballistics that cause significant internal damage.

- Shockwave (pressure wave): A sonic pressure wave travels ahead of the bullet, compressing the tissue. While short-lived, this pressure pulse can reach high levels. Historically, there was debate over its damaging effects, but some studies and accounts suggest that in specific, high-velocity cases, this wave can contribute to tissue damage, particularly in less-elastic tissues like the liver and brain. However, the shockwave is different from the more damaging temporary cavitation effect.

- Cavitation: This is the most important factor in the extent of internal damage caused by high-velocity projectiles. As the bullet travels through tissue, it creates a temporary, large cavity caused by the enormous force stretching the surrounding tissue. The cavity then collapses, with repeated smaller oscillations. This temporary cavitation can be far larger than the diameter of the bullet itself and is responsible for significant damage to tissues and organs that were never directly touched by the bullet.

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Regarding one of the latest theories running amok…that of the tiny lavaliere mic on the right side of his shirt (our left)...

There seems no way a ‘charge’ from that little mic could explode or fire off anything which somehowmoves to the Charlie’s left (our right) and makes the entry wound. That would require the charge or ‘bullet' to go 
across the front of his neck, from our left to our right, and make a TIGHT LEFT TURN of at least 90 degrees
and come BACK and hit him in the throat.  Projectiles don’t do 90 to 180 degree turns...

He was simply shot in the neck and we see the entrance wound.  That’s it. 

The high pressure shock wave from the bullet hitting his neck is what caused the t-shirt to ‘puff out’ and
move high and to the left of the victim.

NONE of these people seem to be researching the physics of a pistol shot.  READ MORE...

 

AL says...

A bullet traveling at supersonic speed, or near it, causes the air at the point of impact to react by generating a high-pressure shock wave. The compression of air molecules in this shock wave creates a powerful kinetic effect, even before the bullet physically strikes its target. This phenomenon is a matter of physics, as the air molecules are not chemically altered during the process. 

Physics of a bullet's impact on air

- Formation of a shock wave: The bullet's immense speed forces air molecules to compress and bunch together in front of it. Since the air cannot move out of the way fast enough, this compression creates a conical shock wave—similar to the sonic boom of a fighter jet—that precedes and surrounds the bullet.

- Pressure effects: The pressure within this shock wave can reach extremely high levels, with some studies showing it can exceed 200 atmospheres. When this shock wave hits a surface, it transmits energy and can cause a concussive or damaging effect.

Can A Bullet Entry Wound Cause Charlie’s Shirt To Blow Back Outward?

AI Overview

Yes, a gunshot entry wound can cause the victim's clothing to blow back and outward . This happens even though the bullet is traveling inward, and it is the opposite of what is typically expected. 

The physics behind the blowback effect

This backward blow of clothing is a counterintuitive phenomenon that occurs when a firearm is discharged close to a person's body. 

- Cavity collapse: This temporary cavity expands and then collapses rapidly. As the cavity collapses, it creates a powerful vacuum effect. This powerful recoil effect ejects air, tissue, and blood back out through the entry hole.

- Back spatter: This forceful expulsion of air, blood, and tissue, called back spatter, is what pushes the FIBERS OF THE CLOTHING OUTWARD.

- High-speed video confirmation: Research presented in a journal from the Association of Firearm and Tool Mark Examiners (AFTE) documents that high-speed video has captured this phenomenon, confirming that fibers are pushed outward by the rush of air expelled during the cavity collapse. 

Factors that influence the effect
Several variables influence the appearance and extent of the clothing blowback effect.

- Body part affected: A contact gunshot to a body part with a confined space, such as the head, is more likely to produce a "blow-back" effect that results in the outward tearing of skin and clothing.

AI Overview

Yes, a gunshot can cause clothing to be pushed backward and outward at the entry wound . While it seems counterintuitive, this is not caused by the bullet's impact but by the rush of high-pressure gases and turbulent airflow that accompany the projectile, particularly at close ranges. 

The physics behind the backward effect.

The phenomenon of clothing moving backward from the entry wound is based on complex ballistic physics and fluid dynamics:

- Muzzle gases and "muzzle wind": The expanding gas that propels a bullet out of a barrel travels at a very high velocity. When fired at close range, this gas rushes out behind the bullet and can impact the target moments later. This creates a high-speed turbulent "muzzle wind" that flows toward the target.

- Vortex rings: The muzzle gases can form a turbulent vortex ring that can push blood spatter backward and can contribute to the backward movement of clothing fibers.

- High-speed evidence: This effect has been studied and documented by high-speed videography. Researchers have observed that the muzzle gas wind can dramatically impact how blood droplets behave and can even cause droplets to land behind the victim.

- Separating entry from exit: In forensic science, the examination of fabric is important for distinguishing entry from exit holes. While the presence of soot ("bullet wipe") is a key indicator for entry wounds, the backward movement of fibers is a documented, though counterintuitive, phenomenon. 

Distinguishing this from other effects

It is important to understand what this backward movement is not:

- Not the bullet's momentum: The backward movement of clothing is not the same as a person being knocked backward by the bullet's force, a common myth debunked by forensic ballistics. The momentum of a small arms projectile is negligible compared to the momentum of an adult human.

- Not tissue blowback: While a bullet can cause "tail splash" or "cavitation" of tissue inside the body, this is a separate effect from the muzzle gases blowing back the clothing.

- Dependent on range: This "muzzle wind" effect on clothing and surrounding evidence is primarily observed at close ranges where the high-pressure gas from the firearm has a significant impact. 

 

I hope this information will shed new light and understanding  on how Charlie’s T-shirt puffed up the moment he was hit.  - Jeff Rense