C: "Standard rules of engagement, clause 1.1.2, subsection 3. Civilian non-combatants must be given sufficient time to evacuate the area of hostilities. Aziraphale can put in a formal complaint to de dark council of the dukes of Hell, if you want. But you'll have to delay your attack until they reply. That could take weeks, maybe. Erm- You lot could all be in big trouble."
A: *Nods effervescently to support his lying husband*
The more I think about the last minutes the more I’m sure Crowley was saying goodbye from the minute Aziraphale told him he’d said yes to Heaven. He doesn’t confess his love like he’s hopeful, he confesses it like a eulogy. He doesn’t kiss him to make a beginning, he kisses him to seal the end. He watches him go like it’s the last time.
Crowley knows Heaven. He knows they’ll want to either make Aziraphale just like them, or destroy him. Either way I think he believes he’s seen his angel for the last time.