Gunshot wounds don't necessarily bleed a lot right away. Much more interesting is the apparent lack of blood on him from any of his "injuries," such as a bloody and/or broken nose. That should have continued bleeding profusely for awhile.

Zimmy doesn't look like he jumped rope, let alone fought for his life and shot in defense of the same. Something's wrong.

plus the trajectory should tell us a lot about his position, in reality.

I don't know. I've never seen a lot of people up close and personal being shot. I would guess that some gunshots may make a mess of spraying blood and other matter while others don't depending on a lot of factors.

Personally, I don't happen to believe that Zimmerman shot Martin when Trayvon was on top of him. Apparently, the physical altercation took place several houses away from the area where he was shot anyway.

but it is reasonable to expect there to be blood if we are to go by GZ BS story.