Pietro grinned, breathing heavily, actually finding himself putting effort into his running, not having to hold back. It was kind of exciting, to push himself like this, and he laughed, stopping abruptly and disappearing under the waves of the ocean and out of reach, watching to see if Tommy would be able to stop in time. He shivered in the cold, but the blood pumping at inhuman speeds through his body helped to keep him from suffering too badly.