I umm, I keep coming back to this and am having trouble visualizing if you're on both hands and knees how he used your shoulder?
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"If a picture paints a thousand words, then why can't I paint you ...."
I'm on hands and knees (stable position). Mate approaches from side with rifle pointed up, kneels beside me (another stable position) and lowers fore-end over my back of my shoulders. Much better than trying to stand up and shoot with the barrel waving about.