Iron Lore a reconnu le bug :
"We introduced a bug into the quest system that affects that scene. If you hit the trigger at the entrance to the room but do not descend into the room within ~30 seconds or so, Typhon breaks his chains and walks to the portal without you seeing it, which causes the Telkines invincibility flag to stay active.
To workaround this issue, when you get to the top of the room be sure to continue into it and watch Typhon walk to the portal. If you have any monsters on your heels just try and drag them down into the room with you.
Sorry for the inconvenience."
__________________
-Chooch-
Iron Lore QA