Estella and Gregory were in Craig Tucker's room, waiting for Thomas to regenerate after his face was bitten off by Pip. They were arguing like always.

Gregory: You just want this whole plan to crumble under my feet don't you, you murder happy!!

Estella: Murder Happy?!? Oh look at what you've been through. No wonder you died so easily

Gregory: Oh, Don't you f*cking talk about-

As you enter the room, you notice that they are in the midst of a heated argument.