Dungeon is die or not ?

[xXDONXx]

hi my friends ...

i was playing BT with people most of them didn't know mesh and after we start we finish 2 bosses only and they left 

my question it's , can i join party they finished the first 2 bosses ? or i should collect same people to play that skybreak again ? 

i know i can wait for next week but i want know if it's work or not 

thank you so much ...