The power of impact comes from pulling your lead leg (the leg you faked a knee/kick with) back at the same time contorting your body to throw a punch with the same side arm. Not entirely sure how the physics work to generate that kind of power, but that's how I've found it to work the most.
Yes, very risky to throw if telegraphed, but devastating when landed.
1. He who spares the bad injures the good
2. To compete is to live, but in order to fight you must first begin by digging two graves.
3. No good deed shall go unpunished.