That pullback stunt is potentially dangerous. A cable is attached to the stuntman's harness and then he's suddenly pulled backward. Whether it's done by manpower or mechanics, I don't know. A similar stunt appears in The Outer Limits: Sixth Finger, when Edware Mulhare (doubled by a stuntman) is telekinetically attacked by David McCallum.
Variations of it in other media occur when a character is knocked off horseback or a vehicle by a sword or a club, and I think one of Chris Nolan's Batman films has a bad guy knocked off the Batmobile or something from colliding with a post. In those cases, the action is staged at the point where the cable runs out of slack, so it looks like the guy is knocked backwards. Camera angles and timing is everything.
To show you how dangerous it is, Ellen Burstyn received a permanent injury from just such a stunt in The Exorcist
. The harness yanked her hard away and the screams you hear when she landed are not