Burn to Learn flashover or backdraft up close with Fire helmet cam

Here is a video of a burn to learn taken from a helmet mounted GoPro Hero2. A crew is sent in to light the fire, the fire grows and rolls over the ceiling. The window is broken out and a small burst of water is used to knock down the fire. The fire grows again and the inner window pane breaks out as the fire begins to roll over again. The upper window is broken out and the fire flashes over. Just as it flashes over an interior crew advances to the room and knocks it down. They then horizontally ventilate ou