>> what we're teaching them is how to control that anger and how to channel that anger so that they don't act out. >> reporter: it's all part of learning one crucial principle -- >> de-escalating, de-escalating. sometimes you turn your hands over. >> reporter: body language? >> body language. but keep in mind, tactically speaking, i have the weapon, i know where it is, but it enables me to respond quickly if i have to. you're almost in a boxing stance designed to not look like one. but it doesn't matter. >> reporter: dan says if the new york police had had some kind of retraining before the eric garner incident, maybe garner's death would not have occurred. he said the police have to get away from those tactics like going for the head to try to bring down a suspect. but he says, you can't unlearn that kind of thing in just a three-day course, wolf. >> brian todd outside verizon center where the washington wizards will be playing in a little while, the denver nuggets later tonight.