if heaven knows, then who will stop

When Hell releases a thing they call Arch-Enemies(tm), successfully unleashing chaos and hatred, Heaven counters with the release of Soul-Mates(tm), successfully unleashing peace and love.

And Aziraphale and Crowley appear to have received, against all odds, each other's names for both the Arch-Enemy(tm) release and the Soul-Mates(tm) grand release. They have rather different ways of reacting to it.