I would have thought that (from the novel's perspective) Michael's sudden, completely successful elimination of Barzini, Tattaglia and Carlo constituted a shot across Cuneo's and Stracci's bows. Vito always counseled not to make needless threats, and none were needed after that.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.