Angelo's Stand ability was brought forth by the mysterious bow and arrow, and apparently they're also connected to DIO. After defeating Angelo, Jotaro thought that the danger had left the city, and tries to find the whereabouts of the bow and arrow. A few days later, Koichi is walking home with Josuke, and they pass a house that should be empty...
Hmph! I was hoping I could
make him into a Stand user
كنتُ آملُ أن أجعله مُستخدِمَ ستاند
Supuse que podría volverlo
un usuario de Stand para utilizarlo,
Supuse que podría convertirlo en
un usuario de Stand para utilizarlo,
Hmph. Speravo di poterlo trasformare
in un portatore di Stand
Minha vontade era transformá-lo 
num usuário de Stand