Jungle Shen bug.
When playing shen as a jungler I've noticed that if his q goes through the rift scuttler, the crab will be slowed as if it were a champion. I am not sure if this is intentional or not, but if it isn't its a pretty big bug since it makes clearing the crab easier to do, and less risky.
All you have to do is pull the Q through the crab and it will be slowed as it is running away from you (not if it is going towards you)