No, there's no excuse for tripping the player(and how do you know he was trying to hurt him rather than just impede him him?) BUT the wall is legal, running out of bounds on your own and staying out is illegal and that is what he did. There should have been 2 flags on that play, one for the trip and one for running OOB and staying OOB which would have been Miami's 2nd such penalty. Instead of worrying about our wall worry about the illegal running OOB on Punts, maybe that is why your punt coverage is so good?