Can't pass Dungeon Siege 2

Not only the water tank needs to be opened, but also things like gates outside must be opened to let the water flow down. A cutscene will appear every time it is opened. If all 4 animations are not completed, it means that the task has not been completed. If the problem persists after all 4 animations are released, try saving the game, then re-entering the game, and then go to the training ground to have a look. If it still doesn't work, there may be a problem with the game, but the probability is very small. I've been playing for 2 years and have never had this problem.