Belleville sur Saône
If a ship in a gas cloud is being counter-attacked, does its player still get to roll a free shield die from his or her dice pool?
I don't think so because it is said "Counter-Attacks may not be countered with shields or a reaction."
Also, can a ship in a gas cloud perform a counter-attack if its player has already rolled a free shield die from his or her dice pool?
Two answers here.
If the free shield had been used to cancel the attack from an adjacent sector, there can't be any counter attack against a ship of this sector.
But if the free shield had been used to cancel the attack from an adjacent sector and if there was support from other sectors, I think that you can counter-attack one ship of the other sectors.