Tormented spirit possessing Catarina

I don't know if this is intended, but I just had a tormented spirit spawn in Catarina's boss arena and possess her. She ended up one shotting me enough times that I lost a portal necessary to sell one of my benches, so ~0.5div lost. Sad.

Anyway, I don't know if this is known issue or something you mean to have happen. Wanted to bring it to light.