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...
But with my hand like this, I guess I can't.
...أظنّني لا أستطيع نظراً إلى يدي
Aber wenn ich an meine Hand denke,
wird daraus wohl nichts …
Pero no podré
con mi brazo en este estado…
Pero no podré
con mi brazo en este estado…
Mais vu l’état de mon bras,
ça risque pas.
Ma con la mano messa così,
mi sa proprio che non se ne parla...
Mas com uma mão dessas,
nunca vou te vencer..
Но с оторванной рукой уже не смогу.