ages as sam just said. talk to me how law enforcement is trying to, you know, try gingerly and carefully knowing people are injured, unclear whether first responders to carry out medical care are able to get inside at the same time. it is a threatening situation. how do officers approach it. they're looking for more suspects, and at the same time trying to tend to those most vulnerable. >> and it is sequential and difficult. you're trying to help people out in need of aid, medical aid and assistance while you try to move to the threat. i have to say this. it is difficult. as former fbi s.w.a.t. team leader, when you arrive on scene, it is chaotic. you try to make assessments in real time. is this a domestic dispute, a hate crime, active shooter, or someone taking whose hostages at to negotiate. that's where law enforcement paradigm has changed.