"An asshole of a monster," Janet says. She immediately gets a little pissed off just thinking about the Beast. "You know in the later Fillory books when Martin stops getting invited to Fillory?¹ He got back in anyway. Umber found him, and, like... I don't know. Trained him up. Corrupted him.

"He ate part of Quentin," she finishes, for a bit of drama.

¹Yeah, it doesn't occur to her that Shen Qingqiu may not be familiar. It would be like not having any familiarity with Narnia. Also, last time she mentioned them, he didn't specifically say he hadn't heard of them.