When a xeno erupts in an Acid Splash, is the attack A) rolled for each victim in Engaged range separately or B) is the one result repeated onto everyone?
A) would make more sense narratively, as the splash has usually been depicted as a spray rather than explosion, whereas B) is faster in game time, but is difficult to narrate (acid drip hitting no-one — acid sprinkler showering 360 degrees).
I don't think there has been a clear indication in any of the YZ:E games on how AOE attacks with rolls are supposed to be handled.