Wheres the clip?

Bruces punch was a trick of sorts he used to stand his dummy in an off balanced neutral stance too. Its a movement of total weight available taken from a different technique.
Getting a percussive blast on the end takes some ripe timing otherwise its a push at best.
Its not for fighting at distance you are too off balance and over committed. It could be used to blow someone off of you though in MMA, specailly when like in the technique it came from where you push the opponents arms one way then revolve the opposite and bang up the opening they leave by their reaction: You revolve both arms around the opponents arms for freedom then move in and blast them head and liver in one strike with two palms one up one down blasting them away like an uppercut and lower cut with a step in or a raised back heel, can sit on it too in some circumstances.