User blog comment:Relikz/Chapter 384: Attack of the Celestials Review/@comment-24066070-20140516075717/@comment-7418318-20140516081606

Maybe slicing Jackal while he's standing so close to Lucy would have hit Lucy as well.

And then there's the matter of the other FT mages who were absorbed and frozen into the walls and floors of Plutogrim. I'm pretty sure the King wouldn't want to slice them apart, so maybe Lucy and Jackal are surrounded by walled-in FT mages and thus the King couldn't simply cut through to them without killing anyone. He certainly seems too big to just go through the corridors.