Slade and Oliver in “Unfinished Business”

Slade

I spared your life back there.

Oliver

I know. But back there, it didn't feel like an act the same way it did with Chase back on Lian Yu.

Slade

Because when I saw my son... I was tempted. I would have done anything to keep us together. But when you mentioned William, I realized that's not my boy. It's Kane. But what I fear, is there is only one way to stop him.

Oliver

Slade, there are other ways to deal with this that don't involve killing your son. Deep down, he's your boy. So you have to reason with him. And I swear, he will listen to you.

Slade

Then I didn't tell you what happened after Lian Yu. I went home, to my son. And I promised him I would stay and never leave. And I broke that promise

Oliver

You broke the promise because of the mirakuru.

Slade

The mirakuru faded for a while. But when it came back, it was like a storm I could not control. And that monster is what my son is trying to emulate. But it's not mirakuru with Joe. It's anger and resentment. And I don't know how that can be redeemed.

Oliver

Well, I didn't think that you could be redeemed. But I'm here. Miles from home. Miles from my son. Trying to help you save yours, and I can do that because I knew the man that you were before the mirakuru. That is who your son needs to see. He needs to see his father. The man who you are right now tonight.