It looks detailed enough there would have been a lot more blood
I confess, I've never seen a nose bloodied by violence but...does it really have to be
gushing blood?
If his defense is true (seems unlikely, of course) and Tayvon was on top of him, couldn't he have prevented himself from bleeding all over his shirt when he stood up? I honestly don't know.
I do rather hate when people try cases in the court of public opinion, so I'm kind of biased towards "howzabout we wait for his lawyer to present a case in court before we call his whole story bullshit?"