|SlimGauge Star Voter 2013|
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Cheetahs never win.
More seriously, at a minimum I'd be having him make concentration checks because he's being towed along at the end of a rope that may or may not be attached exactly to his center of buoyancy (where ever that is). He's probably bobbing along like a fishing bobber in a swift stream.
Depending on how the barbarian moved that turn, it might be anywhere from vigorous motion (DC10+spell level) to extremely violent motion (DC20+spell level). I'd also throw in some of the mounted combat rules (not that the gnome is mounted) such as the one about if you make a ranged attack while your mount is double-moving, that attack happens at the mid-point of the mount's move.