I haz questions.
1- How does anybody know it was the train "driver"? Recognize the shoe?
2- If he is the "driver" -- how is he "driving" from the edge of the train?
3- When did train engineers become "drivers"?
4- How do we know this train wasn't going like seven miles an hour?
It was probably a conductor. The train must have been going slowly or the manoeuvre would not have been possible. IMO the 'boot' was trying to make sure that the guy standing too close did not get hurt or killed. A slow train can still cause serious damage. Think how much the damn thing weighs. If you get hit in the head or knocked out of the way by something that weighs so much, it can be fatal. It was a judgment call by someone with a lot more experience of trains than the rest of us. I wouldn't be surprised that in part the 'boot' was also very annoyed with this guy because those who work in that field are fkg tired of people who, by using little or no commonn sense, get in the way of trains and jeopardize their own safety. Then those driving the trains get blamed for it. All speculation, of course.