Question: who bewitched krum in the maze?
Answer: Viktor entered the maze behind Harry and Cedric, and began searching for the Triwizard Cup. During the task, Barty Crouch Jr, posing as Alastor Moody by way of the Polyjuice Potion, managed to place the Imperius Curse on Viktor as part of his plot to steer Harry Potter to victory in the Tournament.