How about making other things angry? In a stand battle, the ability to keep yourself calm and able to analyze your opponent is tantamount. Making other people angry to the point of irrationality will make them inconsistent in a fight, but also more dangerous, which could be a drawback. It could also work on animals, disturbing them and making them hostile. You could even extend it to figurative anger, like making an object seem "anger", such as making machinery malfunction or making waters choppy.