He looked like he had a concussion. If his nose broke on flat ground he probably hit his head enough to do damage. Would have served him right if he became brain damaged and ended up worse than Casey.

Most of the impact got into his knee, that's why he walks like a retard afterwards

This I know (having sustained a dislocated kneecap before). But I wonder if it temporarily popped out or something?

Don't know anything but this mate

http://encyclopediadramatica.com/The_Casey

Says his knee was dislocated. As I said in a different pic, having experienced a dislocated kneecap myself, I do not think this is the case. I watched the video a few times and Ritchard landed on the outer side of his left leg, which he was favoring as he limped away. So one of two things happened here:
a) it popped out and right back in (lucky bastard...)
or b) he just took the fuck-ton of impact on his left leg.

having it pop out and right back in could make him limp like that, but you do not walk on a dislocated knee if it IS dislocated. You go down, and you stay there.

Little shit bag fucking deserves whatever he gets.