dorn quest, guardian telwin disappears

hi guys,
i'm in the temple of helm looking for telwin and as soon as dorn sees him (and the party it's "transported" in his room) telwin disappears.
is that a bug? what can i do?
i'm in the temple of helm looking for telwin and as soon as dorn sees him (and the party it's "transported" in his room) telwin disappears.
is that a bug? what can i do?
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