[It's enough to make him jump, anyway! Pippin yelps and tries to spin around to face his "attacker", but winds up just falling backwards into the water instead, which is pretty much over his head like that. That results in floundering back into what counts as shallows for him, where there's no way Legolas can swim undetected because there's just not enough water.

Shallows for someone only three and a half feet high is pretty shallow indeed.

Then he shakes his fist at Legolas, though he's grinning, too.]

That wasn't making sure I didn't drown, you elf!