Drogo
"Oh, looks grim." thinks Drogo.  But he figures quick offensive action is best.  Focusing his mind on the realms of fire, he calls into existance a ball of yellow flame in the palm of his right hand, which he is careful to keep above the water.
OOC:  This is produce flame.  On his next action, he plans to throw the little fire ball at the plant creature.  Hopefully, if it extends 6 feet above the water, he should be able to aim above his companions.  His attack, if this will work for round 2, would be +6(1d6)+3