A premature explosion in the cylinder of a gas or oil engine during the exhaust or the compression stroke, tending to drive the piston in a direction reverse to that in which it should travel; also, an explosion in the exhaust passages of such ah engine
When attack is indirect, intentionally setting fire to fuels inside the control line to contain a fire Backfiring rapidly widens the control line providing a wide defense perimeter Backfiring is a tactic which makes possible a strategy of locating control lines at places advantageous to the firefighter