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...
Then it's hard to believe that 
Angelo's the only danger here.
فمن غير المعقول إذاً أن يكون
أنجيلو هو الخطير الوحيد هنا
Es fällt mir schwer zu glauben,
dass Angelo die einzige Gefahr war.
Por lo tanto, me cuesta creer
que Angelo haya sido el único peligro.
Por lo tanto, me cuesta creer
que Angelo haya sido el único peligro.
Ce qui voudrait dire qu’Angelo
Mi riesce difficile credere che Angelo
sia l'unico pericolo che si annida qui.
Então é difícil de acreditar
que Angelo seja a única ameaça.