Originally Posted by listopencil
Yeah, that's where Mythbusters was trying to show that the stunt from Casino Royale wouldn't work in real life. That you aren't going to shoot the pistol that Bond used and pierce through a propane tank. A high powered rifle round will though. A full tank will blow out enough propane to flood a room when pierced. I have no idea where the tank was within the structure, or how full it was, or if the guy was even telling the truth when he said that there was one in there. But if the tank was in there, and it was reasonably full, it could have been pierced by weapons that were on scene. There are a number of ways that the resultant cloud of propane could have been ignited at that point. If you "turn your brain on and think about it" as you suggested, it's silly to just assume that the authorities torched Dorner based on one comment made by a passing cop.
Even if it was inside the house(which is abnormal yes?). If we're talking about a room of gas, there would have been an explosion in the room, likely blowing out windows which wouldn't necessary ignite solid materials. Not totally impossible, just so so unlikely. The idea of a tear gas canister starting it seems far more likely imo