 This is rarely used however, because the lanyard attached to the handle runs through the girt to the valve, which is several inches too short when the girt is extended fully.When the slide is in the armed position and the door is opened, the slide pack falls free of the door bustle (a semi-rigid outer container) and the weight and momentum of the slide pulls the lanyard from the valve, initiating the flow of gas.At about the same time, a metal pin that holds the center of the Valise closed is also pulled, releasing a daisy chain and the two halves of the cover.