If you watch the whole shot in reverse (not just the portion shown in the Twitter thread) it becomes clear the shot is not reversed, or at least it was carefully shot with the intention of reversing it, because Adam’s head bounces upon impact with the ground. It wouldn’t make sense for him to jerk his head up in the way he appears to do in the reversed footage before being pulled up, and the effect it has on the hair over his face doesn’t make much sense in the reversed footage either, so I have to conclude it’s a real bounce and the footage is being played in the direction it was shot. It looks strange and sped up in both directions because of missing frames and a 23.976fps movie being poorly captured at 30fps.

Rey’s totally talking though.