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.
He hasn't laid a finger on me, 
and I haven't opened my mouth.
لم يلمسْني ولم أفتح فمي حتّى
Er hat mich nicht berührt.
Und ich hatte den Mund nicht offen.
No me ha puesto ni un dedo encima
y no he abierto la boca.
No me ha puesto ni un dedo encima
y no he abierto la boca.
Je n’ai pas ouvert la bouche,
et il ne m’a pas touché, c’est sûr !
Non mi ha nemmeno sfiorato, 
e avevo pure la bocca chiusa!
Ele não encostou um dedo em mim,
e eu não abri a minha boca!
Он меня даже пальцем не касался, 
а я не открывал рот!