it would appear that they break out behind a bunker across the back line of the field so that both teams have 5 alive on the break and it causes you to play more as a team to beat other teams in stead of shooting 2 players off the break and having a 5 v 3. this is only my opinion so i could be wrong. as far as the "grid" portion of their name i can see how 5 players on each side making lines vertically down the field and the horizontal lines on the field that some players use to call out positions of the other team can form a grid. this is also an educated guess. hope this helped a little.
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