The problem of cut scenes is that some NPCs must be moved automatically and dependently on the hero’s position. The same situation is at the dungeons of Aleroth but the gate shuts behind you so you may not leave.
I do not know if you are allowed to use the teleporter at this point or not, or, save the game or not; but I do know that there are quests that may not be exited unless you win or die. Therefore saving before taking that last threshold step is inevitable.
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