Blake looked behind him at the ghost. He could see her, but he could always see ghosts, and he knew roughly where to look for her as well as what to look for. But in the dim, grey fog, her almost equally dim grey body was difficult to make out even for him.
It was a good question. Could Alain see her? He had never been able to see ghosts before; despite his powers, that realm was still solely Blake's. However, if Blake's suspicions held true, then it was entirely possible that there was some kind of resonance between the two.