arrive and there's an active shooter, there was a tendency to cordon off the area, wait for the s.w.a.t. teamm to take over, because they are highly trained for that. on the one hand it makes sense, on the other hand we learnt that wait in the moments, that's when most of the casualties occur. to cordon off an area and wait could be counterproductive. we can't expect the officers to rush in without knowing anything, but make a quick assessment. and referring to the old tactics. >> it's the first few moments. >> to the press conference, they brought pictures of the gunning that they believe were used in the attack. long guns and handguns. given the casualties in this sort of situation, how long would it take to cause this sort of, as he said, unspeakable carnage? >> it wouldn't take long. you are talking about a group of people in a confined area. they are not people waiting for this. you see someone you know walking into the room. even if addressed odd by, it takes a second to assess what is going on, they pull out a high-powered weapon, it wouldn't take a matter of moments to do the carnage,