Santa: Haven't you heard of peace on Earth, and goodwill toward men?
Lock, Shock, Barrel: NO!
The Mayor: Jack, I'm only an elected official here, I can't make decisions by myself!
Dr. Finkelstein: That's twice this month you've slipped deadly nightshade into my tea and run off.
Sally: Three times.
Oogie Boogie: It's Oogie's turn to Boogie now!
Jack: Forgive me, Mr. Claws. I'm afraid I've made a terrible mess of your holiday.
Santa: Bumpy sleigh ride, Jack?! The next time you get the urge to take over someone else's holiday, I'd listen to HER. [Points to Sally.] She's the only one who makes any SENSE around this insane asylum! [Mutters to himself.] Skeletons, boogie-men...
Jack: I hope there's still time.
Santa: To save Christmas? Of course there is! I'm Santa Claus!
Answer: Except they're a reanimated corpse and a skeleton. They are either already dead (or undead), or, given how things seem to work, the normal natural laws don't apply to Halloweentown.
Greg Dwyer
But how did Santa survive the Iron Maiden? Especially with how big he is, he certainly would have been killed.
You're trying to apply the rules of the real world to fictional magical beings.
LorgSkyegon