Currently doing the various quests on Solstheim, and running into a problem with the Mead Hall Massacre. I've progressed the Bloodmoon MQ enough that there is fire on the lake, but when I go to the Lair of the Udyrfrykte, the entrance isn't activatable - there's a dark opening, similar to other caves, but nothing to open or allow transition inside.

I tried using the following console commands, none of which worked:

PlaceAtPC "Udyrfrykte",1,1,1
PlaceAtPC "The Udyrfrykte",1,1,1
coc "Lair of the Udyrfrykte"

At this point, I'm stumped. I don't want to use the console to force progress the quest, but I don't know how to get past this. Any thoughts/suggestions?