I wasn’t convinced so much about all this reasoning, your example was good but not so good, BT-SV and AMX have different campo value, so i tried to find some more evidences. Not to miss respect to nobody but just to be sure.
I tried to check again this theory in forum and i find this two discussions: http://forum.worldoftanks.com/index.php?/topic/365131-can-someone-else-ruin-your-camo/page__st__20#topmost http://forum.worldoftanks.eu/index.php?/topic/379458-does-shooting-behind-bushes-reduce-camo-of-other-tanks-behind-the-bushes/page__st__20
Unfortunately with different conclusions!!!!
So i try with game support and it’s +1 to you.
The official response: “Camo mechanics are about your tank only upon firing.” “The bonuses for other tanks within that 15m radius doesn't change unless they don't shoot themselves.”
p.s.
the other problem , being shot at accidentally by the enemy due to the proximity to the spotted tank was not neither in question