Dust failed to win and accepted Chara deal Horror in the last moment of death had accepted Chara help Killer now take full control and only let Chara assist him when he need help
KillerDust's determination flow rate is not controlled by Killer; KillerKiller's determination can be chosen not to be displayed KillerHorror is controlled by Undyne. His chest was pierced and Chara took over. Because this is Killer! Murder Time Trio, Papyrus is replaced with Chara. Phantom Papyrus is replaced with Chara, and Skewered Papyrus is replaced with Skewered Chara.
killerdust doesnt even look like killerdust (he looks like normal killer wheres the dust on his clothes) i see some marks on his clothes but barely any dust