When Trevor sees Elena, he remembers Katerina. He remembers her bright eyes and her playful laughter and the way she was just out of reach.
The doppelganger lies unconscious in the back of his car and all he can think about is how close she is. As he drives, he listens to her heartbeat and remembers Katerina.
What everyone has forgotten over the years is that he met her first. He found her. It should have been him who got to court her until the sacrifice. Klaus should have had no part in that. Maybe if he'd of spent more time with her, he'd of realized how little he meant to her and he wouldn't have been so foolish as to spare her life.
"Better you than I."
Katerina's words have haunted him for five hundred years. Now, suddenly, he is in possession of this innocent little human. This girl who has no knowledge of her importance—much like Katerina when he first met her—and even less knowledge of what is in store for her. He finds he both envies and pities the girl.
Later, when she awakens, he realizes just how potent the Petrova genes are. This girl is exactly like Katerina, if in different ways. She is entitled, but only in the ways of a girl raised in this modern era; she is stubborn, but only because of her fear; and she is brave—foolishly so. She is alone in an old house with two vampires and she just keeps pushing.
He gets nervous toward the end. Her blood is irresistible to him because it is so very familiar and he doesn't want to be around when Elijah takes her away. He doesn't want to be the one to deliver her the way he delivered Katerina—on a silver platter.
Rose pushes and she wins. He owes her for her part in his fucked up scheme of long ago.
When Elijah comes, Trevor wonders if the Original can sense the regret he is feeling. The price of freedom is too high. Katerina didn't deserve her fate and this Elena doesn't deserve it either, but he asks for it anyway.
In his last moments of life—or rather, undeath—his eyes linger on his Katerina look-alike.
He wonders what her future could have been like, had they not found her. He wonders if she would have been happy….