If CK was hit in the neck by a light 30-06 frangible bullet the fragments would travel forward and a deformed central core could lodge under the skin or scapula. Other fragments would lodge in various structures, some would pass through muscle and hit skin, not penetrate but travel along it before stopping. If the carotid was ruptured but not the airway you could get a lot of blood exiting from the entrance wound too. Generally the entrance wound closes and blood follows the path of least resistance. I've seen all this happen hunting but why does his shirt behave that way? Fragments from frangible bullets don't go sideways, the bullet may tumble upon impact and fragment but I doubt we'd, see the shirt inflate as we did, far less energy from light projectiles even when you increase the powder load. Could use a specialist sabot round but you'd want to practice and sight your rifle in with with it first and once again the shirt wouldn't inflate. May as well just use a regular ballistic or soft tipped 30-06, a soft/ballistic tip 5.56 or even a ballistic tipped .22 magnum or .17 HMR rimfires. I shoot the .17 HMR rimfire with ballistic tipped bullets that are by nature frangible, rapidly disintegrates within 2 inches of penetration sending small metal fragments forward in cone. Leaves no exit wound and the entrance wound is tiny, 4.5mm but due to internal damage you often get a lot of blood that can exit the wound in quantity if it has no where else to go and the heart still beats. Finally, I've shot deer and large pigs at close range in the chest with heavy caliber bullets to ensure they're dead, an apparently well hit and dead deer or pig can get up and run. There's no weird asymmetric bulges, just a ripple from the shock wave radiating from the entry point.