If the firing line blue string is stretched forward to a peg so that it forms a triangle with the point facing out to the target, and there is an obstruction (like a root or stump) a couple of feet behind the peg that makes it awkward to lie prone in a straight line, is it permissible to lie sideways on, so that your feet stick out over the firing line (the side of the triangle)? Your trigger finger would still be behind the peg, as per the 2012 rules. The firing line would be flat on the ground, so you wouldn't be moving it. The rule mentioned is the only thing I can find relating to this in the 2012 Format or Rules. I had a situation like this the other day and someone remarked on it, but can't find anything.