It's not that the gun would not function while pointed any lower, it's that the tripod mount that holds the gun won't physically allow the gun to tilt (point) any lower than the level that was just above Scott's head as he crawls towards Van Leyden. That's why at the very last Van Leyden stands up and attempts to jerk the whole assembly (gun & tripod) upwards (up at the rear & down at the muzzle end). It was at that point that Scott reaches up and knocks the gun away from being pointed at him and attacks Van Leyden. There were many different types of mounts for these machine guns. Some of these mounts were fixed movement types while other were user-adjustable depending on what your surroundings were. For instance, when mounted on the rear cockpit of an old biplane type aircraft, you could restrict the movement of the gun as not to not allow the gun's muzzle to be pointed at the pilot's head or (in the opposite direction) the tail of the plane. So.... restricted movement is actually a reasonable possibility. 👍
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