ALL
As you are discussing what move you would like to make, you all hear a sound. The doors in the other room flash a deep, red light and opens. A woman, by the way she acts and how the others listen to her she is obviously some sort of leader, talks to the others in the room and they all nod, turning their attention to the doorway. As she gives the last of her orders, the doors behind her close, and flash the same deep, red light. All of them ready their weapons and the two cultists that you have fought before start to move towards the opening......towards you.
SpoilerOk, so, start of combat. Thematically, I see this as they orders are given, the bad guys are ready, and a couple of them start walking towards the good guys they don't know are there and BOOM, the fighting starts. It is you guys turn in initiative. Since you guys are all next to each other, you don't have to go in the certain order you are currently in, as we have done before(which will be the norm fro now on). So, have fun storming the castle.....