"Eh? They didn't damage the story this badly before!"

Maybe they had been holding back? Maybe Alice's tale had messed up his abilities just like theirs?

When more monsters appear, she's confused and obviously scared.

"Those aren't blots...!" And that staff Ren had was only so much of a costume prop. Too bad. Unfortunately for the two of them, Rosalia doesn't have much in the way of arsenal to fight back, but she does summon a barrier to stop a monster from ambushing Ren from behind.