Felicity: I don't doubt that. I don't doubt that you can beat him, but I'm terrified that you won't kill him because that's not who you are anymore and I am so afraid that Ra's al Ghul is going to use your humanity against you.
Oliver: Felicity, I honestly don't know if I'm a killer anymore, but I do know two things. The first is that whoever I am, I'm someone who will do whatever, whatever it takes to save my sister.
Felicity: And the second thing?
Oliver: I love you.