is this pat-down procedure in effect? and orderly. >> you see some running. i would be. >> but not in the manner you would expect if there was horrific violence unfolding. again, we have no idea what's going on inside, but is there any way to extrapolate, with caution, we can never assume, but what this might indicate. they're doing thesis pat-downs with these patterns in this manner? >> it's hard to tell. you want to get the students away from where the immediate threat could be in the high school, because high schools have windows and you want to make sure all the students are in a safe location. i can guarantee you, they have drilled this. high schools all around the country, especially in the suburban denver area after columbine have been drilling. they drill for fire drills, for bomb threats, for active shooters. and it's a coordinated, you know, training exercise, if you