[Norfleet]

Originally posted by Ironhawk:
Of course its a different story if the spell they are attempting to cast has no valid targets whatsoever or if they run out of gems, etc, etc.

That would be the case if you're trying to fling Orb Lightning at lightning-immune targets, yes: No valid targets available, so the AI defaults to something else. Although with that idea, he'd immediately go back to orb lightning the moment a valid target presented itself.