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...
I was able to encounter this snake.
تمكّنتُ من اللِّقاءِ بهذه الأفعى
konnte ich diese
Schlange hier treffen.
pude reunirme con esta serpiente
antes de morir.
pude reunirme con esta serpiente
antes de morir.
ce qui m’a permis
de rencontrer le serpent.
mi è rimasto abbastanza tempo
da poter incontrare questo serpente.
eu pude encontrar esta cobra.
и уже не смог бы разыскать эту змейку.