Most vids for getting the 3-shot crossbow involve jumping from a moving set of rotating stairs. If you time it right, it seems easy. But if you miss by even a split second, you're probably going to die and have to clear the area again. Even if you survive,
you'll spend the next 3 or 4 minutes making your way back up to the staircase. There's a way to do this by taking advantage of the game's save system, which is impossible to mess up. I made this vid using a lvl 106 Cleric, and my vitality was around 32,
which is plenty to survive the drop down.
No Risk Method
However, if you're feeling adventurous, and want to save the 30 seconds it takes to save and reload your game, here's the method for timing your jump down. I'm terrible at this kind of jumping and platforming, so that's why I'm a fan of the first method in the video I made.
Here's the alternate video