Go back to the castle.

"N-no, I'm f-fine", you say through chattering teeth as you pull on your clothes. "I think I'll just go back to the castle."

Krum argues with you, but you refuse his help. All you want at the moment, is to sit in front of the fire in the Gryffindor common room, and warm up. You hurry down the gangway of the ship, leaving Krum behind you, then toil up the hill.

Near the top, you stop in exhaustion, and look around. You can see the ship below you, and you notice that Krum hasn't followed you. You sit in the snow beside the path for a moment, taking a short break. Slowly, your shivering stops, and your start to feel tired. You let your eyes close. A short nap has never hurt anyone.