The hilarious thing about him is that once you've aggro'd him, his aggression is entirely based on linet of sight. If you turn away and start running, he won't chase you as long as you don't look at him. Alternatively, if you've aggro'd him and get long ways off, then turn and look at him, he'll remember you exist and resume chasing you. TLDR; if you wake him up, and then move your screen so he isnt on it, he forgets about you. Put your screen on him again a mile away, he'll sprint a mile to murder you.