I see no evidence in the video of Zimmerman the night of the incident that would lead me to believe that the had a broken nose, or that his head was hit against concrete or even that he had been in any kind of major fight at all.
Stay tuned though, because I hear it coming, it will be the ubiquitous we struggled for the gun and it just went off....accident...am I the only person that hears that one being lined up ready for tee off? I am betting that will be the next incarnation of the story IMO JMHO and stuff.
Hmmm, here is a still from the video....What's that on the back of his head???
http://s8.postimage.org/3ruc5rjed/georgezimermanhead.jpg