I've seen tons of gun camera from the LW Grunherz, this isn't the first glimpse I've gotten... and I rarely, if ever, see the gunners firing back when they get in that close.
Chances are, those bombers have already been crippled or damaged leaving many crew members on board fighting fires, assisting wounded, or simply trying to get away from those 20mm and 30mm volleyballs being lobbed at them.
The reason buffs are so l33t in AH is because there is no fear, your crew members don't tend to the wounded (ala B17II, where certain stations will be unmanned after fighters have already slashed through the formation and wounded several people)... fact is, the guns ain't firing.. if they were, do you honestly think those Fws would of lived getting in that close?
-SW