You can't accidentally bite someone. Falling on someone's leg after a challenge that you're avoiding by jumping on the other hand is plausible. Let's face it he's a big guy and hardly agile it would be difficult for him to throw his body weight in the air in a split second to avoid where he lands. On both occasions he doesn't look at the oppositions legs to make sure he gets them, he doesn't move his legs to make sure he hits them, he simply falls. Prove he done it on purpose and prove he knew where he was landing or could've changed direction in the air and you have a case. Mark my words, he will not be banned.