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.
It's true that, at first, you were a beginner 
who couldn't do anything on your own.
صحيح أنّك في بادئ الأمر كنتَ مُبتدئاً
لم يستطع فعل شيء من تلقاء نفسه
Es stimmt zwar, dass du anfangs eine
Heulsuse warst, die nichts alleine hinkriegt.
Al principio eras un novato
que no podía hacer nada por su cuenta.
Al principio eras un novato
que no podía hacer nada por su cuenta.
Au départ, tu étais un couard,
incapable sans aide extérieure.
Indubbiamente, all'inizio eri un novellino
che non riusciva a fare niente da solo...
No começo, você era apenas um novato
incapaz de se defender por conta própria.