the dying scream stuffed back in
stuffing the feather snake from his necks' head in Cs' mouth to shut him up from hipitch screaming in case Bostons' Finest can hear
Context
C's death gets the DuPlessis treatment: as the hotshot takes him, his one remaining expression, a high-pitched scream, is stopped at the mouth with a feather boa so that no one outside will hear. The last thing a poisoned man has to say is silenced not out of cruelty but logistics, the gag purely a matter of keeping the noise from carrying, communication shut off at the throat as a professional precaution.