Did it work? Hard to tell. Certainly, Aziraphale doesn't yet realize the demon tried to cure him, as he's much too busy trying to get his mind to meet him there. The new setting, the quiet, the mark, where is his coat, why is his shirt open, and--

"Crowley..." The name comes out with all matter of relief, even if with a bit of confusion and a vaguely dizzy smile. He's here. He's-- he's okay. He's alive, and they seem to be okay.

"He--" It takes him a moment, and he looks down at the mark again. He doesn't quite understand what it is, but it's certainly etched into his physical vessel, and he didn't put it there. And it still burns, somewhere under the skin. Not incapacitating, but very much not a comfortable feeling.