What causes kickback?
The most common cause of accidents is kickback. Kickback occurs when the top quarter of the saw blade, also known as the kickback zone, contacts a solid object (wood or metal). Because the cutter is coming down the edge of the saw bar in the kickback zone, the depth gauge is lower than it should be in relation to the tooth. Literally, the saw bites off more than it can chew, stopping or slowing the chain. The result is a rotational force that flings the bar backward, into the operator. When the bar rears back, the chain break will be activated and stop the chain in 1/55th of second. The saw may still strike you, but the chain is not rotating and the damage will not be as severe.
DO NOT USE THE KICKBACK ZONE AND ALWAYS BE AWARE OF ITS LOCATION!!!