He follows after a while. It's going to nag at him all day if he doesn't, and so far Chin hasn't come up with any leads to tie Danny's - well, transformation is the only word that springs to mind - to anything they've tackled recently.

"I'll keep looking," he promises, giving Steve the kind of look that says, don't you have somewhere else to be?

It's how Steve finds himself in the gym later, resting his hands on either side of the punching bag and holding it steady for Danny's hits, not saying anything to announce his presence. Just being there, standing firm, while Danny releases all of his frustration.