Jt

So I have a strange bug, I'm at the part where you fight the ghost that you can't hurt, and I think I've figured out what to do to properly kill him, except he does it himself. Every time I enter the fight he does a leap that goes nowhere, then proceeds to stand immobile. If at any point I hit him he takes roughly 500 damage and instadies, no loot, no exp, no Natalie cutscene talking about the next part. I can't prevent him from doing the leap, and it breaks him every time. This is on a android tablet if that is important. Any help?