After getting up to 100 in sneak and taking the perk to stop combat when crouched and to do 15 times sneak attack damage, I've found a little issue. Whenever I'm fighting something, I crouch in front of them and immediately use my dagger. If you get the timing right, it will do 15 times damage. This can happen multiple times in a row. On adept, I kill basically everything in one it. I turned up the difficulty and it still only takes a couple hits. Was this intended? It seems potentially game-breaking.
