after you push the three blocks, go straight and make a left, you'll see a symbol you have to push, use force push and then go around, you'll see an opening, go through and you'll see moving blocks you have to pass through. I suggest using force speed to get through. Once you get through, Desann is all yours. I also suggest you use that invincibility ray Desann was using. To use it, there are two symbols on each side of the upper level of the temple you have to pull. Use force pull and pull each symbol, that will activate it. After the beam is activated, go through it, you'll have a few seconds of invincibility. Use it wisely. Good luck and may the force be with you.
A Jedi's strength flows from the Force, and a powerful ally it is, use it wisely!!!