The hell with warning anyone in "their" language. If this takes place in the U.S., IT'S ENGLISH AND ONLY ENGLISH. If they don't stop, or comply with your commands, that's their problem..take them out. I'm saddened anyone has to ask this. Don't allow this mentality to grow as it has with Less than Lethal, Impact, and all other sort of crap that removes responsibility from the criminal/idiot/crazy/alien, and unto the officer on the street. If they say "?que?", just press trigger and repeat as necessary and don't ever mention any doubts or questions in regards to your thoughts on possiblities.