Makes sense now. Transformer fire took out a SLC in a section of South wing while other horns and strobes activated. I have seen that before in real time at Foxwoods and at the Mashantucket Museum.
Internet speculation and misinformation?..... sounds like the wing with the fire smoke alarms didn't go off and the general alarm was a manual pull because the guests Paul Jones quoted said they heard sirens which would indicate the alarm was placed after fire spread.
I did this for an occupation before becoming a facility manager. It's totally incredible to me that a large hotel wasn't required to have quartelies , annuals and weeklies. Sick. They are extremely lucky no one died.