Too many variables and personal preferences.
I spent a lifetime to some learning to do it and teach it.
Have a "SHARP FTO"spend some time with you using red or blue guns...
We have a 40 hour class we put on that has building clearing and Traffic/felony stops.. training uses sim guns.
How do you establish intent?
Well when a naked man is chasing a woman down an alley with a butcher knife and a hard on, I figure he's not collecting for the red cross...Inspector H. Callahan