Diggle and Oliver in “Unfinished Business”

Diggle

You know, Oliver, it's interesting that we're revisiting where we first met. You going at it alone is like deja vu. I thought you and I were past that.

Oliver

This is new. It's bigger. And I'm not going to ask you to take the risk it involves.

Diggle

Oliver, that's the thing about being brothers. You never, ever have to ask.

Oliver

Can you just believe me when I you tell this is different?

Diggle

Yeah. Felicity told me. Some godlike being talking about the end of the universe? What didn't she tell me, Oliver?

Oliver

A crisis is coming, John. He's seen what happens. He's watched me die.