У вашего броузера проблема в совместимости с HTML5
I cheated on 2nd boss, his HP regen is too high. Even after a few mintues of dpsing he was still at 100% hp. Soo yeah, need someone else for bleeds. 2nd, 3rd and 4th boss was all first try. Only first boss that can be tricky, but once you "get it" it's actually really easy.