My faith in Yuna has not diminished just yet
Karin's current state makes me rock hard. She isn't able to see or hear anything but she's able to feel everything and scream as she gets raped by the unknown. She can only half-move too, so she'll try to resist pathetically without any real chance of protecting herself.
So after their first Mankai activation, the side-effects didn't start until they came back from the "real" world, but this episode had proven that it can also happen right after some various Mankai transformation with some binds which entangle some of Karin's body parts. What gives?