I have seen the pictures and the room was fully involved for several tens of minutes. The reason there were some unburned areas on the floor is that they were protected by objects sitting on the floor. Surely you are familiar with the concept of protection patterns.
Hacks always say the room was not fully involved, so they don't have to answer pesky questions about flashover and full room involvement. Here is a link to the photos. If you want to say this was not fully involved, we have nothing further to discuss.
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app.box.com]