Just a quick question here. The druid has advanced to level 3 and she has picked up Fire Trap. This spell will be useful for a variety of reasons, but upon close reading it can be cast on bottles. Her thought is to fill some glass vials with oil cast Fire Trap on them and then hurl them at her enemies for massive damage. I happen to like her initiative and creative use (explotation?) of the spell to have a poor woman's fireball. I'm inclined to let this happen, though I warned her of the dangers of traveling around with 3 of these in her belt pouch, one critical hit or fall could result in a flaming Druid the likes of which will haunt PC memories for years to come.

How would you handle this use of the spell? Would you allow it or rule that breaking the bottles open doesn't constitute opening per the spirit of the spell?