there are at least two wounds there. That's more than falling and hitting your head, unless you bounced a time or two.
Yeah, there appear to be two abrasions there. I don't really know what that proves though. No one says that they didn't fight and both those wounds are completely consistent with any fight that has gone to the ground on an abrasive surface.
Here is my difficulty; those two cuts don't appear to be anything exceptional to me. The only reason they look like they do is because they haven't been cleaned up. I am hard pressed to see them as proof of intentional head slams for a couple of reasons. For one, there is not a large patch of "road rash" abrasion around them as would be consistent with repeated forceful contact of scalp to concrete. For two, you can't even see the wounds under the blood. For three, they did not require stitches that night which means by definition they are either not very deep or skin has been removed making a pull together impossible. As this was supposed to be only 3 mins after and there already appears to be clotting on a scalp would, I am skeptical that he is missing skin.
Of course, all the above is purely wild-ass conjecture based of one media released photo on my part and I could be completely wrong. Hell, based upon what the media has done with this case in the past, it is probably more likely than not that that photo and all inferences from it are tainted. The above is purely my first impression on seeing it.
Best,
Joe