Beneath the surface of the river, Ilde can usually expect not to be interrupted by anything outside of it; there are a lot of reasons why she spends so much time down there, but this is indeed a compelling one, all things considered. There are always exceptions to a rule, however, and she darts sideways when the stranger hits the water to avoid a collision - it's an unceremonious thing not helped by the unpleasant taste his presence in the water leaves in his mouth. Literally, not figuratively; she's not sure what that is, but she doesn't like it.

He might've tried climbing out on his own, if it weren't for the fact that Ilde has him by the throat when she surfaces to see where the hell that came from.