The gals and I are fortunate to have our own shooting range out back. it allows us to shoot regularly... pretty much whenever we want. Sometimes friends, students, and others will join us for some shooting fun, practice, and training. Not too long ago, I had a friend over do some shooting and he asked me, "Why do you yell at your targets?"
When I've taught students simple self-defense scenarios in situations ranging from shooting courses to the NRA's Refuse To Be A Victim program... so many have difficulty deciding what to say when confronted by an adversary. "What are you doing in my house!" Do you really want an answer or have a conversation with this person? A gal has noticed the same guy consistently following her throughout a store, then into the parking lot, down the rows of cars... is "Excuse me, can I help you?" or "Why are you following me?" the best verbal communication? Again, do you want a conversation or do you want them to decide to go a different direction. "STAY BACK, QUIT FOLLOWING ME" with some solid, leave-no-doubt body language might be more effective.
Be prepared... have some verbal commands and judo ready-to-go in your EDC... and in addition to stepping off the "X", scanning and assessing, moving to cover, or whatever else you've chosen to do to prepare for a defensive encounter... try visualizing AND verbalizing while practicing your empty-hand and shooting skills. Maybe... the next time you're practicing at the range... someone will ask you... Why do you yell at your targets?