Gee, you mean taking the talent that halves your HP on a frontline fighter was a bad idea? Amazing deduction, Holmes!
Dr. Koin has always had interesting theorycrafting ideas. He's sort of my hard mode in co-op games. You know the type of quest that requires you to escort a kamikaze NPC that will randomly jump into packs of creatures minding their own business and twice his level and yell "I'm under attack! Do something!" ? Well, that's what playing with Dr. Koin feels like on a regular basis.
And he teleports after bull rush, and keeps spamming the skill.