Hi, I have a question about how gunners work on the SB-2M bomber.
I’m playing as the Soviets and flying the SB-2M. Normally, I can switch between the pilot and the front gunner, but gunners 3 and 4 are inactive and I can’t control them.
Recently, during a battle, my second gunner was probably killed, and for the first time ever the game switched me to the rear gunner. I was able to shoot backwards, under the tail of the plane.
So now I’m a bit confused and wanted to ask: what is the bug here? 
Is it a bug that I was suddenly able to shoot from that rear position, or is it a bug that the other gunners are usually inactive?
Thanks