You seem to forget your sword is made of paper, and really isn't capable of cutting anything open.
However, with the pony's already weakened health, the blow is just enough to take him to critical condition. His pulchritude takes a hit too.
But the cold night air is imminent, and you have to do something. You decide to get into his mouth for warmth.
Ah, snug as a bug! You have a feeling you'll get a pretty good night's sleep.
While you were doing all that, the elf entered his magic two bedroom bungalow for the night and locked the door. Man, it sure looks warm in