You can actually get out that way, if you look up, run up the stairs, and jump at the right time. However, there's another way out of the crypt that Rethpian tells you about (if you brought him a rat pie... ooh, I loves a good piece of rat!).
If you didn't bring him one, then try pressing the elevator button in F'Lokis Ra's room and getting out of the elevator before it goes down. You might be surprised at what you can find [img]smile.gif[/img]
If you haven't found F'Lokis Ra yet, you'll need to do that anyway...