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...
his Stand's hand outside the mirror is...
...فإنّ يد الستاند الخاص به خارج المرآة قد
ist die Hand seines Stands
außerhalb des Spiegels …
significa que su Stand en el exterior…
significa que su Stand en el exterior…
qu’en est-il de la main
de son Stand dehors ?
la mano del suo Stand
al di fuori dello specchio è...
então, lá fora do espelho,
a mão do Stand dele...
значит, оторвалась и рука стенда…