 The two heroes descend on the Goblin Kingdom , and begin putting out the fire ; this , in turn , hurts Flame Princess , both emotionally and physically , judging from her shedding of a single tear . Finn , horrified at the pain he has caused the object of his affections , exits his robot and calls for Flame Princess 's attention , before crying . The tears alert Flame Princess that Finn is a " water elemental " , and that the two will only hurt each other , due to the opposition of their natural states . 
