Jo backed up as Saerian leapt out of the mirror and advanced on her. Her back hit the bathroom wall almost immediately. Which actually was a good reminder for her to shove the terror aside.
Walls. Phaedra had mentioned thinking about walls, and Jo had been practicing that.
She just had to concentrate. Which was a lot harder while in the middle of a nightmare.
A brick wall sprang up between them. Jo didn't know how long it would hold, but she poured all of her will and focus into it.