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The death of an Archdemon such as Satan, who has been sticking around Hell since its conception, didn't go unnoticed. The Archdemons were the first to notice it. All four of them that didn't participate, but that were actively cooperating together with Satan to go against Mammon and Kireina, and also Lucifer, who has been keeping a mostly neutral stance within hell for eons now.
Within the Layer of Sloth, Belphegor gasped in utter disbelief the moment he heard the screams of utter agony coming from Satan. His soul was shattered and then eaten, and the Primordial Sin he carried divided and shared between two Vessels!
"Ah, I was having such a good dream! What was that noise?!"
Inside of the Layer of Lust, Asmodeus, who found themselves resting inside a big bed surrounded by all kinds of Succubus and Incubi opened their eyes wide, noticing the death of one of their strongest fighters, Satan!