Pretend video evidence doesn't show Zimmerman with the described injuries even though it does.
Oh wait, we're already doing that.
Even if the wounds were exaggerated it wouldn't matter legally. An attack is in attack whether it breaks noses or just stings a little and an attack is definitely a threat of imminent danger, legally justifying a shot. Anyways, video evidence and police reports corroborate the injuries so....
Regarding blood, even if Zimmerman was in the original clothes, the minimal splatter would be hard to discern in a grainy video on a red and black jacket as discussed at the end of the last thread.
And before "Yeah but his grey shirt..."
As X pointed out it was raining. His jacket would've been zipped.