Crossfire PingPong -- 2 Questions

[NBGB]

Consider the attached Eastern Front situation....a KV1 has wandered itself into the fire area of 3 different German AT units.(Image attached)
(To be fair ... they would have not all been visible in limiting terrain using our Double Blind...so...there is that...)
The German participants in our little vignette: 
A-- a 222 recon AC with a 0AT at 4hexes...
B-- a 37mm AT gun with a 2AT at the same 4hexes
C-- a PzIIIG with a 3AT at it's 5hexes....

Clearly to get any kind of good odds on the KV1 Crossfire is highly recommended....
Since all the units are separated, they cannot activate at one time---thus it's going to take 3 activations....
Say it's beginning of the Turn and MIRACulously the Germans roll and get 3 activations--...so...the shooting begins...

A takes a shot--- and that would be a -5....now...
  ...FIRST QUESTION.... Confirm, even though there is NO CHANCE of a hit--it can take a shot--setting up the first Crossfire shot?
C then takes a shot... it would be a 3+2=5AT on the KV1 at this point.....Assume it is not successful with either shot....Desperation rises in the German camp...
SECOND QUESTION.... 
At this point with the 3rd Activation--- B would like to shoot---is it a 2AT or a 4AT??
4AT because the KV1 was attacked by C...and considering ONLY that, the 37mm would get Crossfire...
or
2AT because the first shot in this turn's ambush came from A, and it went through the same hexside that B would as well????....

Thinking about this, and wanting to progress the game, we agreed that the "Tank would react to face the first fire...thus only C gets crossfire, B is confronted with the
Full armor of 5, not a reduced inferior side or rear"....thus the tank platoon is NOT spinning around to face each shot--it responds to the first shot, and that sets the Crossfire for
That turn...Thus the B unit fires at only 2AT...

HOW do those who care decide this? Does this align with how others have/would resolve it, did we miss something or has anyone some other rationale to offer giving B a 4AT?

*One might make the case that given it's a platoon, some vehicles would turn to face the C threat
--thus exposing their soft behinds to the vagrancies of B...(as yet unknown perhaps...)...