If you want, considering how it was gonna be the last night of their lives n all, Ferrucio could’ve told her that he was the one that set up the assassination plan on Estelle. Which isn’t exactly correct, but I think he may have still wanted Sherry’s reputation to be intact despite everything. I dunno if he’d apologize for it or whatnot, but he wouldn’t resist if Ophelia thought that this would be a good time to shank his ass.