[Elle Bee]

if he was alive his heart would have been pumping blood all over the place

even TM's hoodie has just a small patch of blood

He stopped pumping right away

again ... Good shooting GZ

.

[Tijeras_Slim]

Entry wounds tend to close up a bit, so Trayvon could have bled substantially into his thoracic cavity. Much more likely though, is that his heart ceased activity fairly quickly after the shot.