Hi guys, I have read and of course agree with both of your claims on the firing arc. but while I think interpreting the rules is important for game play, sometimes it is best to step away from the rules for a second and actually look at the two ships in question. , if you fly up to someone who is blind behind them (except for radar) and cannot fire on an adversary that is behind them hence their firing arc is in front of them and is " the standard firing arc" then we all know back stabber can get an extra dice. However the Falcon has gunners who can see and shoot 360 so there really would be no real advantage to backstabber because of the unique firing arc. And slave one's auxillary firing arc is for deploying mines so getting behind slave one with a backstabber would not be the smartest choice one could make. this being said I do believe in my experience that, the firing arc would mean any firing arc that any given ship has available. and though there is no clearly defined rule on it as you both clearly state, the term "firing arc" means a definite path in which weapons can travel. and since back stabbers ability is intended for being out side of any path of weapons fire. that would mean any and all firing arcs no matter what kind of firing arc any particular ship may have. since back stabbers ability lies in firing upon an opponent when that opponent cannot immediately fire back at the attacker using backstabber. I hope this makes sense as it is late upon my writing this. this is how I would rule if it came up in a game I were playing. thanks for listening to my side.
By your explanation Backstabber should not get his Bonus ever when attacking the YT.
He also should not get it on an Ion-Cannon-Equipped Y-Wing if within Range 1-2.
In my opinion this interpretation is pretty much contradicting the rules as written.
I also do not know, what you mean by the Firespray's auxiliary Firing Arc being meant for deploying mines. It has nothing to do with mines and if you are referring to Fluffwise then it is based on the fact that it can spin its main armament to the back if required, IIRC.