I think just some random person. He said "I asked Cornell to guard the mountain" So it wouldn't make sense if he had Cornell executed because then, who will guard the place while he's busy doing unspeakable things just for the revolutionaries to stop suspecting him for hiding Maximin's body.
Yeah, that's the reason I was confused too!
Then what's that panel with that chantel (girl with the short hair) and her lover being separated from each other?? And then the guillotine scene right after
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Little question- is Jean saying Cornell was executed? Like, was that part of the unspeakable things he's done to protect Maximin's grave? Or is it just a random person on the guillotine?