Manic Maze (Jaws Unleashed 28)

This side challenge you should be fine if you know what you're doing, you've got to kill the swimmers as fast as possible before the timer runs out the swimmers are inside a course with underwater walls, so you'll have to go in and follow the course path (This is all YOU have to do to make it easy: active target lock and press down on the change target buttons to immediately aim for the head, and bite the head to instantly kill the swimmer) that should make this mission super easy.