[There's definitely no issue with Shun keeping up - despite how calculated his motions through the trees are, they're also incredibly quick, and he's not too far behind Tsuna when he reaches the fire.

As soon as he gets there himself, he picks up the thread of conversation as if they'd never left it.]

You know who it was? All I've heard so far is someone mentioning "him", which doesn't give me much to work with.

[Not that Shun's going to chase after the guy while there's still this to deal with, much as he'd like to, but it could be useful for future reference as well.

In any case, he nods towards the fire.] Will your powers work on that, or do you need it sized down?