So, enemy comes around close to a fireteam of a Kriigel, Tagmaa and something else. He is both in ZoC and LoS of both the Taagma and the Kriigel. Taagma decides to shoot, Kriigel decides to Eraser. Do they break the team? Why? Both AROs are attacks, just different skills. I think that they would break as they are declaring different skills ( BS Attack and Comms Attack), however, I can find nowhere that specifies that fireteams need to respond with the same skill, and not the same type of ARO.
It is generally understood to be “the skill you are declaring as your ARO”. Labels matter sometimes; the BS Attack label says that the skill is “a form of BS Attack”, which can sometimes be used to create an equivalency. However, there’s no generic “Attack” skill/ARO.
That's not sufficient, different Skills are still being declared. You're probably thinking of this FAQ entry: Q. Are Skills with the BS Attack label considered to be BS Attacks or other Skills when declaring a Coordinated Order? For example, could a Coordinated Order be made where one of the members declares Surprise Shot, another Forward Observer and a third troop shoot with a rifle? A. They are considered to be BS Attacks, so can be combined in a Coordinated Order. But that's specific to being able to use Skills with the BS Attack Label by declaring the BS Attack Skill. 'Attack' isn't a Skill that can be declared.