Alex and Fred:
Alex should've seen it coming and in a bit, when he wasn't doused in cold water and freezing his ass off, he'd kick whatever was left of his ass for letting Fred lure him. She'd told him she was going to drag him in, and now he was in the freezing cold water. His muscles tightened and he had a mouthful of water. He wasn't at risk of drowning, but it did send quite the shock through his system.
He surfaced as soon as his adrenaline kicked in, and that was after the moment of surprise managed to fade and he remembered he had control over his body that was screaming at him to get out.
He gasped for air as soon as he was able and went scrambling for the shore. It was a good thing he was on the swimming team because he knew how to get there faster than a doggy paddle.