here's the video. no one touches him, it's a grass field, knee doesn't bend too severely, he walks off on his own. If not for the reports i would think its just a sprain or something
http://www.nfl.com/news/story/0ap1000000065046/article/darrelle-revis-out-of-jets-game-with-knee-injury?module=HP11_headline_stack&module=HP11_hot_topics