The sounds of a scuffle reach Thor's ears quickly, so his immediate reaction is to herd Carlos away from danger. It's only when he realises that he knows the voices he hears in the distance that he begins to pull the scientist toward the chaos. He leaves his fully healed scientist to the side, because it only takes a sparing glance for him to realise that he doesn't much like where this is going.

"Stop!" He barks, his voice dark and commanding. This isn't playful Thor, this is a Thor with a chip on his shoulder and a hunger for payback. No amount of progress could ever lead him away from his pride entirely, so he can't bring himself to allow Bucky to steal the satisfaction from him.

If Bucky doesn't pull away, Thor is going to reach for Tom's arm and try to wrench him away.