No kidding. I used to ride this train (it's called MAX it's not a subway) with my little kids when they were this age. There were a couple of times when this almost happened, and I just forced the doors open with my hand.
This dad let go of his kid and pulled his arm back into the train.
I'd rather have my arm cut off than face my wife after losing my child on a train platform. What if that woman hadn't have been there?
“I’d rather have my arm cut off than face my wife after losing my child on a train platform”
You obviously chose your wife wisely!