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...
Now I'm infected, damn it!
!ها قد أُصِبتُ أنا، اللّعنة
Jetzt bin ich auch
infiziert, Scheiße!
¡Ahora me infectaste a mí, maldición!
¡Ahora me infectaste a mí, maldición!
Je suis infecté, putain !
Ora sono stato infettato pure io, cazzo!
Agora eu já fui infectado, porra!
Проклятье, я точно заражён!