lol! well he did chop his own horse's head off originially as well. I still wouldn't call that particular display justice though, because everyone knew the mountain did what he did, and im sure he did not care to admit it either as well as the fact that oberyn died for this, im sure his sister would not have wanted that. But if it is as you say, and there are repercussions, then I think the long awaited justice we find in the land of westeros will be toward the end of the series