Originally Posted by
LFJ
The application possibilities depend on the particular posture. Some do the downward punch straight down to the side or front, some do it angled more 45° downward to the front.
In the forward angled version, the strike drives into the opponents center of gravity, collapsing their hips, causing their body to buckle forward extending their head and often raising their chin, which prepares for the logical following technique in the uppercut.
When it is done straight down on the side, it is a defense against an arm drag or wrist grab from the side. When the opponent pulls you rather than resisting you go with it "punching" your captured arm downward and dropping your stance, which will pull the opponent down as you slam your shoulder and body into them. There is also a stomp there to crush feet or cause disturbance at the same time. Your other hand is next to the shoulder as a guard or can be used to assist pulling the opponent downward, which will then create a similar preparation for the uppercut as in the previous application.