you can assume that the staff was used on vorador, how else do you expect him to have been captured by moebius and his crew??
As someone who knows about the fate of Raziel, and logically was educated in the ways of prophecy, fate, time, and destiny by the ones who created them, he may have accepted his fate and been waiting.
He may have also known that someone (Kain perhaps) would raise him again. But that's all specualtion. I just don't want to assume the Staff works on Vorador, because we havent' seen it work on Vorador. Call me overanalytical, but I prefer empirical evidence over specualtion, when available.
Besides, the Sarafan may have just brought a big bucket of water. He isn't invincible you know. I mean, Moebius isn't without his own methods of offensive magic.