Thanks for the tip. That description is confusing; it says the High Servitor went into the Temple of Crota, but I was very confused when I went completely through it--and into, "The World's Grave," without finding any Fallen. Then, I see your video, only to find they are outside the temple entrance. I had noticed the red on my radar during one of my double-backs, but it seemed to lead to the surrounding wall, so I figured that it was just the enemies back at Anchor of Light...not realizing there was a hidden alcove up there. Sheesh.