Board Thread:General Discussion/@comment-7599817-20130521060237/@comment-6413863-20130701022743

I have, but for me they left a note behind mentioning I was "a freelance assasin working for the Dark Brotherhood" behind which instructed them to kill me. I had the encounter twice on that path above Raven Rock overlooking the temple.

It seems to show up roughly when the dragon respawns.