It took them HOW long to hit the Stop button!?
And they try to move potentially injured people from the scene. I wonder if the courts punished them severely for such shoddy operations.
The stop button only shuts the electric motor down, same for the emergency stop. That is what’s called a rollback, you can see the bull wheel (driven wheel, usually at the bottom) is turning backwards so it’s completely decoupled from the drive motor. My guess is the only brake is on the shaft connecting the motor to the gearbox, with a coupling probably gone the brake is useless. What’s making it turn? The weight of the wire rope, chairs, and skiers still on it.
On lifts here in the states there are anti-rollback devices, such as metal blocks on the bull wheel with dogs that ride over the blocks when the wheel is turning forward but engage the blocks to stop the wheel in reverse. Others have a rubber roller that rides on the bull wheel, connected to a tach generator that provides a signal to keep the mechanical brake released but if it stops or turns backward the brake automatically applies. (It’s been 15 years since I worked on lifts so I may have a few of the details wrong.) There should be a mechanical or spring-applied, hydraulically-released brake that physically stops the bull wheel, maybe maintenance is shoddy or maybe standards are lower there.