When she surfaced? Manny couldn't help but catch that remark which suggested that Waverley might not be as "human" as she appeared. It wouldn't be the first time he'd encountered somebody who wasn't human, he saw ghosts on the regular and also lived with vampires and were creatures. It did make him curious about what she might be but it wasn't like he could ask, that was rude.
Okay he couldn't help himself especially when Waverley mentioned show it was good to have somewhere big enough for her to swim and stretch.
"Okay, I gotta ask, what did you mean by 'when I surfaced'?"