I think you can't actually strat it with a single person, I could be wrong though. I always just burned it before it put me in the hat. If there are three people fighting that boss it will never do the hats, so could just drag a couple alts to have the time you need to kill it lol
Edit: Not sure if it happens every time, but I've also just stood in the hat and eventually the boss runs inside of it and you can just kill it
This post has been edited 1 times, last edit by "Trogdor6996" (Nov 28th 2015, 11:48pm)