User blog comment:FleetAdmiral88/Funkfreed and Lasoo/@comment-5115277-20120616024231

The sea just causes DF users to lose control over their powers, and makes them lose their strength/become unable to swim. Luffy was still able to stretch underwater, Robin created her giant hands, and Chopper remained in his half-beast half-human form. The same should apply to Funkfreed and Lassoo - they would still be alive, at least until they drown (at which point the fruit would probably leave them and they would become a lifeless weapon at the bottom of the sea).