Risotto figures out that Doppio must be a Stand user that the boss trusts in deeply because he’s able to hear the noise from a certain Stand. Risotto then uses his Stand Metallic against him. Metallic is able to control magnetic force and attacks Doppio. Doppio uses the part of the boss’s power he received from him. While they’re fighting, Risotto realizes that Doppio’s personality and actions seem to be changing and he realizes exactly who Doppio is.
All I've been thinking about is 
where he was attacking me from
كلّ ما كنتُ أفكّر فيه هو من أين سيُهاجمني
Ich habe nur daran gedacht, wo er mich
mit Rasierklingen und Scheren angreift.
No hacía más que pensar
en desde dónde me atacaba
Solo me centraba en pensar
desde dónde me atacaba
D’où viennent les ciseaux
et les lames de rasoir ?
Finora non avevo fatto che chiedermi
da dove mi stesse attaccando
Eu me concentrei em descobrir
de onde ele estava me atacando
Я думал только о том, откуда 
на меня нападут с лезвиями и ножницами.