"It happens a bit in the Good Book," Tuck said. "The Bible's a bit full of things like that. Though...seeing the way it affects people is vastly different to reading it. Some people very dear to me were held captive about half a year ago. While they were there, there was a demon who could take different forms. It made them believe their father had died in front of them, when he was alive and well. So it isn't new to me, though no less horrifying for that. For others, it may be quite the shock, yes."
He considered, for a moment, the crux of the question. "It may worry people, but forewarned is forearmed, yes? If they are aware of it, this thing might have less chance to catch someone unaware."