All hand strikes have a "sucker punch" application (which is like a non-telegraphed pre-empt strike) So do do all weapon quick draws and some kicks. Building non-telegraphed strikes (is a deception) and is vital practice.
All these should be practiced
1) solo "in the air" (checking overall body synergy)
2) solo, hitting objects (like heavy bags, etc,)
3) partner drill, the trainer:
- offers an easy, stable target
- then flashes a target
- then for suckers and pre-empts, gives advice to see if you are telegraphing
4) partner drills "While holding"
- your one arm is wrapped by a trainer, you strike his other hand holding a mitt
- you wrap his one arm and he holds a mitt with the other for your striking
- all strikes and kicks while also holding knives, guns and sticks/batons
5) partner drill combat scenarios
6) all of the above, standing, kneeling/sitting and on the ground
If you are going to bother to do one? You need to do them all, all the way.
Choosing the pre-emptive is COMPLETELY DEPENDENT upon each situation. Thinking one will solve all problems is not good. The pre-emptive strike is also dependent upon the position/stance you are in right before the strike.
Hock