Grim Tangle Delwyn blocking path bug

I'm in the grim tangle and came across Delwyn on a narrow path. He's just standing there, won't move and is blocking the way onwards to the spirit. I can't see it but the music has started playing so must be close. There's no way past him.

Update - I eventually managed to cut escape shot and use that to backwards flip over him but then the music ended so I guess the spirit got away. Oh, well!