That raises a question, actually: how was Behrlihn able to teleport the Dragon Knight out of the crystal? And would he have been able to do the same with the Divine?
It appears that the crystal prisons were the work of Ygerna in the first place, since after she died, the Divine's prison shattered.
Behrlihn is an order of magnitude more powerful than her, if what the dialogue from the game tells me is true. And of course he would be able to take the Divine out of the crystal. We literally saw him do the same thing with the Dragon Knight.