Wow, that is really incredible! Thank you so much for sharing this information, even if you know what to look for it is not easy to come by with these illustrations sometimes!
To a shooter, the offset horizontal slits need no explaining. It give him both a far and a near view of approaching threats. The offset was not designed to screw up the aiming of an attacker, who could simply aim at any 90-degree angle formed by the junction where the vertical and horizontal slits met.
