This is what append on turn 6, in game 64378:

6. Mr.Pio fired at Sockdude5, distance 1 with no deflection. - 9 points. Damage BR: Fuselage, (Base:7,Stb:+2,Dice:+3).
6. Sockdude5 fired at Mr.Pio, distance 1 with no deflection. - 5 points. Damage B: Wings, (Base:7,1Gun:-2,Dice:+1).

after that, I got a special damage: 1 gun destroyed. But all shots on the same turn are simultaneous. So why did I get a 1gun:-2 modifier?

the link is: http://www.youplay.it/play/bm_GameMove.asp?GameID=64378&Status=STAND