In the hospital, Jonathan rekindles his friendship with Erina. A man called Will A. Zeppeli heals Jonathan's broken arm with a supernatural technique called Hamon. Meanwhile, Dio continues to prowl London, recruiting the vilest men he knows into his undead army, including Jack the Ripper. As Zeppeli trains Jonathan to master Hamon, which kills vampires, he explains how he has dedicated himself to mastering Hamon in order to destroy the mask. Jonathan, Speedwagon, and Zeppeli travel to the town of Windknights Lot, where people have gone missing. Whilst passing through a tunnel into the town, they are attacked by Jack. As Jack tries to lure them into a trap, Jonathan is tasked by Zeppeli to finish him off without spilling any of the wine Zeppeli has poured into a glass. Using the wine, Jonathan comes to understand Hamon, allowing him to kill Jack from the other side of a wall using his own Hamon technique: Overdrive.