@Zanzabar
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Your earthen arms flail at the water and go "splash splash". The sharks eye them hungrily and confusedly


@Jaras
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So long as there is at least 5' of smoke between you, you may continue to make hide checks. Now, if he were to step out of the smoke on any side and happen to see you, you would lose all benefits of concealment, including your ability to hide. So long as he is in the smoke... you're inveeeesible (as long as you continue to roll that well on your hide checks).

As for dispersing the smoke, I believe that there is no wind, so the smoke will not disperse... the entry for a smokestick says it disperses naturally, but gives no indication as to when that happens