Come here. [ And there is some small pause there, before she decides to add: ] What is your name?

[ Because whatever it is, whoever she is, Gamora is going to at least try and help. She certainly doesn't disagree with the need to keep oneself safe. Anyway, even as she waits for the name, she'll move straight on into demonstrating how she's holding the knife. She had already been holding it blade pointing towards the ground and that is how it stays.

She moves it so the blade comes up, now held outward, away from her body, though also so she isn't aiming it towards Athena. ]

See this? This is how you'll want to hold it. Away from yourself, always, so the chances of self-injury is much less in a fight.