sentences:  The 1970s saw the birth of the huddle, which pioneered the act of pinpointing a shorter pass to a teammate.In the modern game a quick kick-in exists when a behind is scored in a largely vacant forward-line; the rule change (see below) means that the opposition cannot man up, and the first couple of kicks generally come very easily.For non-quick kick-ins, huddles are sometimes used, which require man coverage.