Dragon Age: Origins On Xbox 360 Bug? ***See Details***?

I am on the quest 'Captured' near the end of the game I am a human Mage or Magician and I chose to have Leiliana and Sten save me. There affection levels are all the way there. I have found my warden and alistair and given them their armor and everything i have clicked on alistair and all he says is Being locked up in a place where everyone wants to kill you makes me wish I was a templar. And stuff like that. And I can't get my warden out i have unlocked the cells and defeated all the guards and everything! HELP!!!!!!!!!!!!!!!!