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...
How dare you hide it from me?!
!كيف تجرؤ على إخفائه عنّي؟
Wie kannst du so was vor
mir verheimlichen?!
¿Piensas que puedes ocultármela?
¿Piensas que puedes ocultármela?
Come ti sei permesso di nascondermela?
Por que você a escondeu de mim?