User blog comment:General MGD 109/Leviathan powers, subpression or immunity?/@comment-3045936-20121208010216

You have to take in count that in Purgatory they knew that Castiel was there. Also, Purgatory is a spiritual world the same rules might not apply on Earth. And On Earth, they thought he was still dead, so maybe they are immune to angelic powers, and supress angels when they focus on it. Yes, when Dean, Castiel, Meg, and Sam attacked Super Corp they could have seen Castiel and just turned on their power to surpass angelic powers. However, unlike how Eve's power is more like an area of effect, Leviathans seem more limited to just close range. I mean Eve's worked for over a town, and even in Purgatory they were just too close as Castiel told Benny and Dean.