I've watched several times this video animation of Neil's death in Tenet. At the 45 second mark of the video, we see inverted Neil approaching the locked door. Now, from Neil's inverted perspective, Ives and The Protagonist (TP) are already on the other side of the door, contending with Volkov.
Why, then, does Neil need to intervene by unlocking the door for Ives and TP? Couldn't Neil see that Ives and TP already made it through the door (he sees them reverse-fighting Volkov)?