Note: Him getting his "head smashed" into the concrete was never evidenced pro or con - can we stop just assuming one side of the story is completely accurate and the other is not?
He was evidenced to have hit his head on the concrete ONE TIME, in line with say FALLING ON YOUR FUCKING BACK AND HITTING YOUR HEAD ON CONCRETE ON THE WAY DOWN. I've personally seen people that have literally been curb stomped before (in fact my one trial I've had to juror for was a curb stomping incident locally... horrendous) and amongst other things the had noticeable dents and fragmentation of their skull, not minor contusions. [And note, I've personally had "hit my head" falls due to my health issues, and although I'm not bald to get quite the same visual I bet if I was the wounds were pretty damn close]
Or more in short - unevidenced memes aren't evidence. Stop using them as evidence.