How do I get past the spinning blades of death in Raldbthar?
Looking around some more, I found a playthrough by YouTube user Gullahjack12, where he tackles it on the first try:
The trick is to not try to jump over them, but to use the alcoves—that don't look wide enough to fit a person safely—to avoid the blades on the side. By following just behind the blades, you get to a safe zone way before the blade comes back around.
Slow Time shout works as well. You can walk between the slow moving blades.
You can use the "Become Ethereal" Shout. Just the first word is long enough to get you past both of them while running.