I agree with you John, doubt this is the best position.. if not for scaring the enemy, thinking that some kind of nasty chemical field-ration-dinner weapon will be unleashed. Or shocking them, and reveal their position when laughing!
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If the guy was dead.. why not lie the rifle on the chest, would reduce the shooters siluette as well
Perhaps it would work as a close range defend, eating some shotgun pellets just before todays pea dinner