WTF??!!
Police should've been to his room in 10 minutes tops!!!
He stopped shooting after about 12 minutes. He wasn’t shooting the entire 72 minutes. They would have gone in if he kept shooting.
1. A police officer and security guard were on the scene within about 10 minutes.
2. There was gunfire from inside the room and the security guard was shot through the door.
3. There was apparently no gunfire from inside the room from this point on. All of the carnage outside was already done by this time.
4. The SWAT team arrived shortly after this. There was visible wiring from inside the room to the video camera the perp had rigged up on a food cart in the hall, so they treated the scene as if the room with the (now quiet) perp inside it was potentially booby-trapped.
5. The SWAT team conducted whatever surveillance was needed (probably using tiny video camera probes under the doors and through the walls), and they finally entered the room at the 72-minute mark.
They were outside his door in sixteen minutes. He detected them and started firing through the door. His target priority became the police instead of the concert goers.
The two police officers held their positions until SWAT breached about an hour later. He was found dead.
At some point, and probably not long after the first officers arrived, he committed suicide.
He was not shooting for an hour plus straight.
An hour and twelve minutes of shooting?