In the Netflix movie – The Old Guard, there’s a scene between Andy and Nile in the cargo plane when they were escaping from Afghanistan. Nile asks Andy how many more of them are there in her army. To which Andy replies "four".

Now here’s the thing – apart from Andy there are only Nic, Joe and Booker in the team. So who is the fourth person here? Was this just a mistake made by the production while writing the dialogs or was Andy actually privy to the fact that