HaHA! The fight had been brutal, but the wicked Sir Robin (no matter whether he kept saying he was not wicked; Arthur knew the truth) glanced away, giving Arthur the opening he needed. Poking Robin in the belly with his sword, Arthur yelled, "I win! The princess is mine!"
Belatedly following Robin's gaze, he noticed the girl. He also recognized her. "Morgana? What are you doing here?"