Satan felt it the moment Lucifer died. How could he not? They'd been the same person in myth and lore too many times for him not to feel the sudden burn and the terrible emptiness that followed. Inside Lucifer's building, his hands curled into claws and his eyes turned distinctly snake-like.
This was not acceptable.
He double-checked a few of the traps he'd set for his wayward Sins in case they got past him. Small bombs, motion-activated machine guns, and in one case a flamethrower. It wouldn't stop them from reaching Wrath, but it might kill one or two of them, and that was really what Satan wanted at the moment.
Then he waited in the lobby, his hands folded behind his back. When the first Sin poked their head through the now-wardless door, Satan just smiled.