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.
We came all the way here, 
but it's just a waste of damn time.
قطعنا كلّ المسافة إلى هنا، لكن
هذه مضيعةٌ للوقت
Der lange, weite Weg,
aber letztlich vergeudete Zeit.
Vinimos aquí por nada.
Vinimos aquí para nada.
On s’est tapé tout ce chemin
pour rien, putain !
Siamo arrivati fin qui,
ma è stata solo una perdita di tempo.
Viemos até aqui, mas foi pura perda de tempo.