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It's about them having met before time, since before the universe, it's about aziraphale watching crowley bring into existence the universe they both love so much.
Oh so you're just gonna tell me that aziraphale and crowley were literally just standing (floating?flying?) there before the beginning right next to each other watching the big bang happen together. Ok yeah ok sure I'm normal about yeah ok yeah I'm alright (I'm not jesus christ).