Often times in Icewind Pass the quest NPC Bael Thrymskald completely disappears. He can't be seen, can't be interacted with. You can still place the mead and spears in the appropriate locations, but you can't talk to him because he's not there. Which makes the Frost Giant Moot quest frequently annoying/difficult to complete unless you can find your way into an instance where he exists; and since you can't freely change instances, you don't have a lot of options on that one. It seems if you just stand there for several minutes he'll eventually respawn.
I assume this is because the Demonic Escape HE occurs right next to him (one of the portals very nearly spawns overlapping him, and the "quest areas" on the maps definitely overlap), and he gets deleted along with the HE sometimes.
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