That was warning enough. Norton let his cloak spread out beyond his suit. The man-demon's hands aged
and weakened as they came into contact with that cloak. Hastily he hauled them back, cursing backward.

...

The demon put away his knife and let the girl go, bounding back to Norton's vicinity. This time Norton
grabbed the demon, his white cloak extended, and held him fast.
The demon screamed. "You're killing my body!" Indeed, the body was aging. The skin wrinkled; the
clothing rotted and fell away. In moments the shriveled body collapsed. It had died of old age.