From what Cavuto & FBI related guest are saying, lonegunman/nasa contractor, has barricaded himself in, by himself, without taking any hostages. If true, as long as there’s no way for him to ..like ignite large tanks of rocket fuel, why not just wait him out?
Lock him in and turn off the lights and put the A/C on 40 degrees while blaring teletubbies songs over the loudspeaker over and over.