[He does glance around just to ensure there aren't any others in the water - he'd been swept too far to get a good look at the people he'd been helping, but from what he can see they're doing fine - and then the Doctor does sink down to sit on the ground with a squelch.]

Tech? I usually carry some myself but I find I don't rely on it as much as I used to. Much prefer relying on my own senses. So long as I have my--

[His voice trails off and his eyes widen, then the Doctor starts patting at his coat.]

My sonic screwdriver! Don't tell me fell out in the water!