Any maned gun, 5ich or lower will generate a Killed By message, unless he is taken out before the kill is awarded, an example of this would be if you were strafing a maned gun and he took you wing, but you managed to get the gun before you hit the ground, so he got you but you got him before the kill was awarded, smae goes for ship guns if the ship is sunk before you hit, or bail, he will not get a kill message.
It should be noted that this map in one of the few whear this type of realy dense Flack is a problem, last night 4 US fleats were off 7 for instanse in the same location, very have Flack and ack for the Japanese.
Maned ack is not effected by the Auto ack/flack seting's howeaver.