I watched the play earlier today and what I saw was Suh being tackled by the o-line then held down by the linemans right arm, at which time Suh tried to get up and became pissed that he couldn't and tried to get the olineman to let go (pushing him the only place he could since he was being hugged) and then tripped over the lineman when he got up, stumbled, and out of frustration stomped on the ground, and it just so happened that the guys arm was between his foot and the turf. Was it necessarily malicious? No. Was it a very poor example of maintaining composure? Absolutely. He's being held and tackled every play and unlike college, he can't get through it and that makes him mad. But he's got to be better at controlling himself because when Suh gets angry, people die.