You make stronger tactical decisions and only escalate the force, if necessary. This internal focus protects you and allows you to make sound decisions. This is the officer-based approach to solving any difficult situation. Things to consider are the size, build, ability, and aggressiveness of the individual. This includes weaponry, vehicles, cover, etc.
Several questions come to mind here.
Read the situation. Try to control your breathing. Take a deep breath, hold it, and release. You must be in control. If you have your weapon out, you must find or be behind cover.