Police Story 1985 Jackie Chan bus stunt

I’m just chillin watching the movie and then the bus stunt scene looks a bit too real. I slowed it down and zoomed in. It looks like they really might have broken some bones for this movie -UPDATE - There is a video with Jackie Chan explaining this stunt. This was an accident. The bus driver didn’t have the experience performing stunt driving, he only knew how to drive a bus. Not familiar with how airbrakes on a bus would perform in a case like this stunt, resulted in the bus not braking smoothly. The actors lost their balance and instead of flying out and landing on top of the parked car, they went straight down.