Video length: 1 min 35 secs. A video that shows a rollover fire that happened in a fire drill.
An article about the definition and description of rollover. Also known as flameover, it is a stage of a structure fire when fire gases in a room or other enclosed area ignite. Since heated fire gases, the product of pyrolysis, rise to the ceiling, this is where a rollover phenomenon is most often witnessed. Visually, this may be seen as flames "rolling" across the ceiling, radiating outward from the seat of the fire to the extent of gas spread.