Grey was shocked to learn that Black could, in fact, override his power limiters. Which was quite a feat, as the limiters should drain Black's power faster than he could summon it, but the fact that she was given magical hyper-sensitivity, and then he summoned a handful of acid scarabs, a bottom end insect meant to help keep the death world from getting too much decomposing matter everywhere, into the wound, even as his claws began swirling about. Realizing that Grey couldn't stop Black without removing his own limiters, which would cause Black to kill her immediately, instead he reinforced the block in the Were's mind, keeping the human from having to deal with the pain. White was helping, though he was also trying to keep her conscious from panicking, as they had always been linked and if she panicked about losing contact, she might instinctively try to breach the barrier.