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...
As for the part that gets scraped away...
...وبالنسبةِ لما تتمّ إزالته
Aber wohin die abgekratzten
Teile verschwinden,
Mientras que las partes desaparecidas…
Mientras que las partes desaparecidas…
Encore mieux, moi-même j’ignore
Le parti che vengono cancellate, invece...
Quanto às partes que foram removidas...