look at our thermoheater at 900 degrees. >> now stand up. it's a lot different, isn't it? we're going to take the available oxygen in the room and replace it with whatever is burning. >> reporter: experts say if you're ever in a fire, get low, crawl on your hands and knees. the ground will be cooler, visibility better and more oxygen, something firefighters do. >> you crawl in and you see and you feel. when you can't see, you have to rely on your field and your hearing. you have to feel for that heat. if you don't feel the heat, you're not in the right spot. >> reporter: we crawled towards the kitchen where so many fires start. the heat and the weight of the hose nearly debilitating. sparks shooting everywhere. if you're a victim of a fire, you're in that house, waiting for you guys to come in, what's the most important thing you can tell one of those people. >> stay calm and get as far away from the fire as possible. >> reporter: a few miles away and a couple of hours later, our cameras are rolling as the bryan fire department is dispatched. this is no ordinary call. they