of course they do not stop at some token onion, potato or coal in the stocking,nah
will hunt down the little miscreants and eat them.
Well, some of them, the rest are delivered to Grýla's sack and she gets to boil them alive for the christmas soup...
and there endeth the tale.
Unless, some good, brave child chases away the cat and rescues the bad children from the sack.
Yeah, good luck with that.