I tried doing and alternate way, CTD COC'd to mehrunes shrine, ending up inside no problem, then used unlock to head outside, CTD. I could keep up with him until about 300ft away from the shrine, when the game crashed, just before that bear at the bottom of the final stairway. So I've collected all pieces of the Mehrunes razor and turn them in to Silius, who proceeded on his way to Mehrunes Dagon shrine.
