Guns have recoil. The recoil can hurt you if you hold it incorrectly. If you hold a sniper rifle incorrectly, even with 2 hands, you can blow them both off from the sheer force of the rifle for example.
Now you are holding the gun rather awkwardly. It may not be a howitzer, but it has recoil. A revolver has a lot of recoil. You can hurt your self because the gun can bend your hand in ways it shouldn't be bent.
Heh, when I said "I can't see how it would hurt" I meant I can't see any reason why it shouldn't be put in the game because if you don't want to shoot that way then don't. :laugh:
I know about firearms and recoil but even while firing a higher calibre pistol sideways I couldn't see how you'd hurt yourself, if you were going to hurt yourself then you'd be holding it even more weirdly than turning in over to the side.