I remember I couldnt finish the game because there was a bug that stopped me from playing. it was a part where you had to climb up floor to a level to activate a bridge, but for some reason he would not grab the level. just kept swinging his arm.....

What version did you play when that happened?

I've beat Soul Reaver a number of times over the years and I don't think I've encountered anything other than floating torches. But I was playing the Dreamcast version, have played pretty far in the PSone and PSN versions though no issues there.

It may just be random fluke bug that you experienced.

The PC version of the game was patched back in the day and that's likely built into the GoG release already. GoG usually incorporates all official patches into their games.

The other possibility because it happened to me the first time playing through to stump me years ago, was I just missed part of the puzzle and couldn't move a lever. Actually just last night when heading to Melchiah I go into the gear room to lower the floor and I went to the crank first forgetting I needed to flip the switch on the other side of the room first to move the gear into place. So Raziel attempted to move the lever with no luck. Then I was like "duh" and ran back over to the other side. With all the puzzles its kind of easy to miss the obvious in Soul Reaver.