drop bear
Sr. Grandmaster
Tactically, as I mentioned, it's all about overwhelming pre-emptive forward aggression at close range.
In terms of body mechanics, I could demonstrate it in person better than I can describe it in print. But fundamentally it's hitting with the full body weight as a unit, mostly by driving the whole body into the opponent (as in the forearm strikes) or dropping the body weight down (as with the hammer fists), but occasionally using rotation of the hips.
It's not a bad method of power generation and it's pretty appropriate for the types of techniques that he's showing.
Bursting I think it is called.