For the creature just keep running he will teleport to you when you reach a certain distance from him.
Think those teleport lines are the same ones that block enemies from following you all the way across the map.
Now off to find killer bunny again, he fell of a cliff during the fight as I was hiding from him off a ledge and taking pot shots with my bow

.
He respawned I guess and now I can't find him anywhere. I might stand a chance against him now at level 19 and a creature but can't find him, ran around the island 20 times. Even kicked every single bunny I could find to see if that angered him into showing himself but no go.
Maybe he is gone for good.