He nods. "But I don't know if that's why it felt strange. Might just be because I'm not used to working with it. But people are mostly water, right? Just in a different form. If I can stop all sounds a person creates, then I'm stopping sounds going through water... But, I - don't take that too literally. I don't know exactly why that felt the way it did, and most likely it's because it was something I hadn't ever tried."

That's the simpler explanation, and he knows that simpler tends to be more correct in the majority of situations. Better than trying to speculate about how water interacts with his powers on some kind of molecular scale. That's for another day, if ever.