I've chosen B, but I think something more extreme than B.
Just like what we planned during last woe, but this time, even more extreme.
Since we have a lot of assassin cross, each of them will be divided into two groups that go to different castles. And then, the emergency caller will snap to the emperium room with pallies, snipers, professors, slow gracers and do the ecall. Pally should be spamming devo on the ecaller. The ecaller should not think whether both assassin crosses teams are hitting the emp or not. Therefore, the ecaller's castle destination is our main target.