Almost-accident a Shanghai Stadium subway station

Yesterday at line 4 of the Shanghai subway I saw how we came close to another accident that happened ten days ago described here by the Shanghai Public Transportation. Then a passenger actually got stuck between the "safety doors" and the subway and was killed when the train took off. Micah Sittig translates the story on a weblog, entered ten days earlier.
Yesterday a man fell with one leg between the train and the platform. The man seemed in pain and there was some screaming going on. He was just in time able to pull his leg out as both sets of doors started to close. A security man was at the scene and he was able to halt the train from leaving, but when there would have been a few seconds less to act, we might have seen another accident.
One of the conclusion of the witness of the deadly incident:

So I think that that the company is responsible for not creating a standard signal between the platform staff and the drivers, and that if there was a standard signal that the staff could make that the driver would understand and not start the train, then in today's situation the accident would have been avoided. So I think what's missing is a signal between staff and drivers for use in emergency situations, that is to say a signal that would emphasize that it's NOT ok to start the train.

What I see at some stations that since a day or ten some of the guards carry a green flag, indicating to the driver he can leave safely. But the systems is only used on a few platforms and certainly not on all platforms with safety doors. It looks like the system is only used after a really nasty incident.
My victim was relatively unharmed: his foot seemed painful and one of his shoe was laying under the train.