I was in there when it was still a crime scene, they wanted to get some ventilation going in the library and the fire alarm was holding it out. Most of the “bombs” were like oversized firecrackers. They had strikers (emery paper?) on their sleeves to light them on and throw them. There were body outlines over blood pools and placards with names on them. And goo on a shattered ceiling tile over the placard that said Harris. They burned some ammo in there.
I was there sometimes to work in the mechanical room and parked my truck by the outside door. There was a .45 in the glove box. The interior door opened into the hallway just down from the library. Shame I wasn’t there that day.
As it happened I was sitting in the school district security office working on some software issues with a Johnson Controls tech. We watched as it unfolded, on TV news and listening to the security radio traffic. After some hours and when we finished up, the JCI tech said he better go find out where his son, a student there, was at. Unfortunately, he was in the library working on homework.
A relative of mine is on the SWAT unit of another Colorado police agency; he went into the line of work an uncle of mine was in and I went to the military side instead. But he paid some very close professional attention to the methods of the responding units, and was not then nor later has he been impressed. *Cowards* was just one of his conclusions.