So a combination from Buk Sing CLF, right side forward:
1. 前標吊馬 - 右插捶 (dash + right charp chui)
2. 上左步 - 左插捶 (left foot switch step, left charp chui)
3. 上右步 - 右插捶 (right foot switch step, right charp chui)
This one is good for closing the distance especially if your opponent has limited space to run. Very, very basic stuff, three straight punches, you can go between body and head anyway you want. The first dash is to close the gap ASAP. It's less telegraphic to hit him with you lead hand and a dashing step-in, than throwing your rear power punch from the get go.
If he's backed up against a wall, you might not want to use two switch hits, maybe you only need one, then just dig your feet and pound on him. But yeah, after you hit him with your lead punch (or miss, doesn't matter), then switch hit with the power hand, and really try to hurt him.
But sometimes you don't wanna do the switch advance, I mean you don't want to miss your target and hit a wall or something. Just use common sense, that's all.
It is bias to think that the art of war is just for killing people. It is not to kill people, it is to kill evil. It is a strategem to give life to many people by killing the evil of one person.
- Yagyū Munenori