As they later break up the Algorithm to hide it, the Protagonist sees the red trinket on Neil's bag. Neil reveals he was recruited in his past by a future Protagonist, and they have known each other for a long time. He must now return to the recent timeline in which an inverted Neil dies. In a final scene in London, Priya plans to kill Kat, given her knowledge. Realizing that he created Tenet, the Protagonist kills Priya first, watching Kat leave with her son.