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.
The one who gets too excited in 
this situation is the one who dies.
الشّخص الذي يتحمّس زيادة عن اللّزوم
في هذا الظرف هو من يموت
Wer sich von seinen Gefühlen
leiten lässt, wird sterben.
Los que pierden la calma
son los que mueren.
Los que pierden la calma
son los que mueren.
dans ces moments-là,
on meurt de la main d’un agité.
So che sarà chi si lascerà 
trascinare dall'emozione a perdere!
Quem se exalta nessas situações
é quem acaba morrendo.
тот, кто даст слабину, погибнет.