Board Thread:Unanswered Questions/@comment-26417223-20150821135519/@comment-25045164-20150822123302

Unlike special raids, the non-targets during emergencies can be left out of the equation and S rank is still obtainable. Perhaps they can compensate if your room does so little pre-emergency. About B7R, can you estimate how many enemies are still flying? The only time I got A rank and zero enemies in B7R is when there were a lot of them left flying when we entered emergency phase.