If it won't fry the bird and it won't fry Foster, well, then it probably isn't going to fry Childermass. He shrugs at the bunny girl and proceeds to cross the remaining few steps between himself and the crystal wall. There, place a hand of his own flat against the surface.

"I know you can hear us," he tells it, although he does feel a little ridiculous to be talking to a wall, of all things. "I believe you want this to end as much as we do. Please, let us pass."