How would I do this? I got sneak to drain while you move albeit for moving backwards, but I want to make it where when you run out of stamina you lose 50 points on sneak.

I think I have it half right, set it up where it starts on loss of stamina by looking for equal to or less than 1 percent, then this is the part that gets me I call out to a stamina enchantment and use 0.5?