Jack,

     Look at his play in this game, on his first hit of Gronkowski, he held onto his ankle after the whistle had blown. The hit on Welker near the Ravens sideline and the coup de gras, his final tackle on Rob. IMO, he seemed to be trying to roll and pin his weight on his ankle(s). His hits on Brady and Welker in previous years may have been accidents, I think this was intentional.
It's all food for thought now, Gotham awaits.