The alignment of the motion.
1. Serpentine technique – the walk on a narrow field of fire 1 for the front 2 left 3 right and 4 backside
2. Rolling-T technique – the trails are wide and 1 and 2 will be responsible for the shooting in the opposite direction. The movement of 1 and 2 are parallel to it. Do not overlap much. Buddy will be shot. We do not cover the Buddy’s gun, And not as a target for opponents to shoot 3 for the front of the fire through 1 and 2, and 4 beware back side.