[there's something akin to relief flooding him. Mushi are things Ginko can handle, making this much better than it being some shitty experiment thrown at them]

Good. He'll handle it.

[.... a smile curls on his face when a thought occurs. Probably a good thing Toph can't see it. And he says in a voice loud enough for Katara to hear (or at least he hopes)]

Ah, Toph-chan, could you ask her if it's alright if I stop by later to check in on her? Just for a few minutes.