[ It's a good question, one Gamora wasn't certain she would have been able to answer before. By all rights, Nebula could have killed her – and Gamora would have almost expected her to. She'd been so close, but— ]

We started to argue.

[ Her nose wrinkles at the memory – something like distaste and frustration. ]

She just suddenly let go and claimed that she'd bested in me in combat, that she'd won, even after I saved her life. We bickered— [ Which sounds absurd, giving what else had been going on. ] —and she said that I was—

[ She pauses, frowning. ]

... That I was always trying to beat her.

[ And Gamora is competitive; that's no secret. She wants to win, and she accepts that, but this was different. The tone of her voice is enough of an indicator, deviating away from that forcefully distant tone, and instead, to something heavier.

But what had really made Nebula stop? That's the greatest question, isn't it? She could have ended it all with so little effort, and she could have finally had the revenge she’d been dreaming of for years.

But why didn’t she take it? ]

... She stopped because for all those years, I was the one who wanted to win—

— and she just wanted a sister.