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...
The Stand that you acquired, The Hand, 
gives me chills just thinking about it.
الستاند الذي حصلتَ عليه، اليدّ
يخيفُني بمجرّد التفكير به
Wenn ich nur an The Hand denke,
läuft es mir schon eiskalt den Rücken runter.
Siento escalofríos cada vez que pienso
en The Hand, el Stand que obtuviste.
Siento escalofríos cada vez que pienso
en The Hand, el Stand que obtuviste.
Le Stand que tu as obtenu,
The Hand,
Il potere dello Stand che hai acquisito, The Hand,
mi fa venire la pelle d'oca solo a pensarci.
Eu fico arrepiado só de pensar
no seu Stand, The Hand!