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...
If I can just block it once...
...إذا استطعتُ التصدّي لها ولو لمرّة
Wenn ich ihn einmal
abwehren kann …
Si puede bloquearlo un solo instante…
Si puede bloquearlo un solo instante…
S’il peut le contrer
une seule fois…
Se riuscissi a bloccare questo suo attacco...
Se eu conseguir me defender
de pelo menos um golpe...
Если он сможет… разок его сдержать…