Stay on the ship.

You refuse Krum offer.

"I'm not a Durmstrang student", you remind. "It wouldn't be right for me to do one of your traditions."

Krum accepts you reply, and the two of your stand in silence for a time.

Suddenly, the ship starts to rock violently. Krum, who is used to the movement of a ship, adapts well, but you stagger towards the rail. The ship rocks again, and you fly over the rail. You fall, but manage to grab a rope with one hand. Krum looks over the side, and shouts something, but you can't hear it over the turbulence that erupts in the water beneath you. Something grips your leg. You look down, and find yourself staring into the eye of the Giant Squid. One of its arms is wrapped around your leg. The Giant Squid gives you a sharp tug, and your hand flies free of the rope. As the Giant Squid carries you away, you see the Durmstrang ship get smaller and smaller.

Finally, the Giant Squid throws you in the air. To your surprise, you land in snow instead of water. You realise that it has carried you to the other side of the Black Lake.