As he feels the water pressure begin to increase and swirl, Gregor quickly changes forms and begins swimming in a safe manner. (not that anyone can see)
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I rolled a 6, for a total of 30..but as noted elsewhere: freedom of movement should protect us from the rushing water. Sorry to have edited this, but my roll was a 6.
(1d20+24)[30]
Kua-Toa Leviathan
This bloated, fishlike humanoid has a scaly body of silver-gray. Its arms and legs are thin and small for its size, but its gaping maw looks big enough to swallow a horse.
Gregor the Kua-Toa Leviathan
Relevant Skill for this encounter: Swim = +24 (+16 str, +8 racial)