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.
Which means, now that you've 
been robbed of so much iron,
معنى هذا أنّك جُرِّدتَ الآن من كمّيات
،كبيرة من الحديد
Und da du so viel Eisen
verloren hast, bedeutet das,
Es decir,
ahora que has perdido tanto hierro,
Es decir,
ahora que has perdido tanto hierro,
Bref, vu la quantité astronomique
de fer que tu t’es fait voler,
In altre parole, ora che il tuo corpo
è quasi completamente privo di ferro,
Estou dizendo que eu roubei tanto ferro de você
А значит, оставшись 
без большей части своего железа,