Three days after the incident, Jonathan awakens to find Erina nursing him back to health in the hospital. As they rekindle their friendship, they encounter a strange man named Will A. Zeppeli, who performs a technique on JoJo which allows him to soothe the pain of his broken arm. Zeppeli tells JoJo about the technique, known as the Hamon, which uses the energy of ones own body to perform impressive feats of strength. He also reveals that Dio still lives, and it is Jonathan's fate to go against the Stone Mask. As Jonathan ponders about not getting Erina involved, Zeppeli notices the ripple energy residing within him. 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 the Hamon, he explains how he was one of the first to discover the Stone Mask and witness its dark powers, dedicating himself to mastering the Hamon in order to destroy it. Just then, Speedwagon informs them of people going missing in Windknights Lot, so the three of them travel there. Whilst passing through a tunnel into the town, they are attacked by Jack, and Zeppeli enters into a fight with him to give Jonathan his one and only lesson into how to use the Hamon. As Jack tries to lure them into a trap, Jonathan is tasked by Zeppeli to finish him off without spilling any of the wine he has poured into a glass. Using the wine, Jonathan comes to understand the Hamon, allowing him to kill Jack from the other side of a wall using his own Hamon technique: Overdrive.