They're not moving unless you look really closely. They're hardly going to detangle, jump out and bite him.

Possibly it'd be more alarming if they did do just that.

"Uh huh. Their diet's mostly rats and the creepier crawlies we find around the castle. We know they're doing their job well if I have to take them out to find food." She's already turning to the door, but she looks over her shoulder at him. "So try not to smash a snake if you see one indoors, okay?"