Close to Roundhouse Knee

Offensive (not counter) use of the knee :
1. Instead of closing the gap with a jab, the lead-off fighter uses a check of the right hand of the counter-fighter.
2. Inside the guard, and on the flank, the right hand latches behind the neck.
3. The knee to the face is delivered.

The important thing to remember is that as long as you close the gap properly, any technique can be used - even a "counter". Why wait for your opponent to lead-he might hit you!
Maxim: "It's always faster to act than to react."