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 then, there are two 
possible actions I could take.
حسناً إذاً، أمامي خياران مُحتملان
Tja, ich könnte nun
zweierlei Dinge tun …
Hay dos cosas que podría hacer:
Hay dos cosas que podría hacer.
Deux choix s’offrent à moi.
A questo punto, ho
a disposizione due opzioni.
Bom, tem duas coisas que eu posso fazer:
Что ж, теперь у меня есть два варианта.