The person hiding in the mirror was Illuso from the Hitman Team. Fugo ends up being dragged into the mirror by Illuso's Stand, Mirrorman. Fugo then summons his own Stand, Purple Smoke. Despite Giorno wanting to find Fugo, Abbacchio decides to go look for the key, since that was their mission. However, once Abbacchio finds the key, he also gets dragged into the mirror world...
That snake has immunity!
!تتمتّع هذه الأفعى بمناعة
Die Schlange ist immun!
¡¿La serpiente es inmune?!
¡¿La serpiente es inmune?!
Le serpent est immunisé
contre le virus !
Quel serpente è immune al virus!
Que a cobra é imune!
У твоей змеи к нему иммунитет!