Phantom Blood - Chapter 37
Meanwhile at Dio's castle, Poco's sister is in company with Dio himself. Dio proposes for him to turn her into a vampire, giving her free choice, but at this, she slaps him. Dio merely smirks at this and introduces her to Doobie, who happened to be right above her. As he leaves her, he tells Doobie to do as they please. Doobie attempts to rape Poco's sister, but, from the skylight, an anvil falls on his head. Doobie looks up to see Jonathan and company.
Jonathan leaps to attack Doobie, but poisonous snakes emerge from his mask and bite Jonathan. After Doobie does this, he takes off his mask, revealing the snakes that seem to be growing out of his face. Doobie then goes to attack Jonathan, but Jonathan grabs all of the snakes and forces the poison out of his body with the Ripple. Jonathan sends a Ripple into Doobie's body; his snakes conduct it and they turn on him, killing him. Afterwards, Poco reunites with his lost sister, and Jonathan leaves to find Dio in the castle.