Piety bug in Harvest

During the first Malachai fight (with Peity) after she changed her form and her life reduced to 50% she didnt change her form back to "normal" Piety and stopped attack me and my golem. She started to ignore me and Malachai was also unkillable.
After my character died and re-entered arena, she changed her form and everything was good.
http://imgur.com/gYMCo9y
http://imgur.com/ZMJOTh9

I don't know if this was the case, but you have to stop hitting her to get her to change. Just like when you see her in the Cremetorium.

I always hit her, even when she was changing her form. Im not sure, but i think that this bug appeared becuz i was using this gloves and firestorm trap