So each time I get to the "Place Hurk's head for real" requirement (after killing the large arachnid) and then interact with the placement podium, nothing happens. I've watched videos to see the normal interaction. On my game, his head does not appear and I cannot interact with the hologram thing to the left.
Looks like I'm stuck.
I've already restarted the checkpoint, quit and started a new game several times each.