When you have another Archfiend that can roll a die and "Darkbishop Archfiend", and the other Archfiend is targeted, you get to roll both dice, and you can choose which one to roll first.
When you have another Archfiend that can roll a die and "Darkbishop Archfiend", and the other Archfiend is targeted, you get to roll both dice, and you can choose which one to roll first.