In pic 8 of the NYT article you see two guys standing, one holding the other up. You also see someone in a red coming off the train (right side of pic).

In the video, the person in red walks over to these two men. The person in red is carrying a lanyard and drops it on the ground in front of him. He/she motions them to stand still. They take direction and face this person and stand still. The person in red (back turned to us so hard to tell) looks like they take a picture. Then the two guys turn around and “hurt” guy goes to the ground.