Nita nodded, a physical gesture, to go with a sort of mental ding! - courtesy of the peridexis, naturally - that she was receiving Piccolo's power and it was being fed into the spell.

Piccolo might or might not have overheard the noise, but he would also get a sense of confirmation, that there was some form of intake there and it was working properly.

/Thanks. I'll start casting this, and when we're done this place'll look a lot better. Don't stop the feed until I say so, though, okay?/

Just so he'd know one way or the other for sure.