Create water spell cast inside another's air bubble?

[dubj1979]

I'm running a Skulls and Shackels campaign for my brother and nephews age 7-13. A fight went overboard and I had 2 baddies pull a Druid under water. One of the bad guys managed to cast air bubble on his partner and then swim back up. The one with the air bubble continued to pull the Druid deeper. So getting desperate the Druid managed to cast create water into his air bubble.

So the question is if it is possible? And if so how would you let them do it?

I told the druid that he had to roll and beat the caster of the air bubble spell's Dc+spell lvl+caster lvl.

I told the group that I would look up the rule because since they are kids they figure if something works once they will keep doing it.

[ZanzerTem]

The air bubble allows the creature touched to breathe underwater or in similar airless environments, or protects the object touched from water damage.

The Air Bubble would repel the water created. That is how I would rule it.

Either way the Air Bubble would still allow the caster to breathe normally. Create Water can't cancel the effects of the ongoing spell. You would need dispel magic or something similar.

[dubj1979]

Ok, that makes sense. The water would be pushed out and away from the spell. Thanks!