In Firetop Mountain a summon spell has to have a target and that target is the future controller of the creature.
Can you target a summon spell at a NPC creature in play (for example, a goblin) instead of a player? If it is possible, how will it be controlled (i.e. who will direct the new creature)? And what will happen if you target it at an Elemental (that doesn't have a controller by definition)?