Ahav’s utterance “Have you found me, my enemy?!” upon facing Eliyahu’s accusation, is an implied admission of guilt. This is contrasted with Ahav’s utterance of “Is that you, o troubler of Israel?!” when he meets Eliyahu during the drought. In that instance Ahav is accusing Eliyahu of being the enemy of the nation and claiming that he is its defender. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion