Warpath toggles if you only press the assigned key for a very short period of time.
Doing this in rapid succession causes my character to physically spin without warpath being activated. This sometimes also causes warpath to be active i.e. dealing damage without the model spinning or consuming mana. During this, skills like Echo Knight were active but Reckless Spin wasnt.
Shield Rush often teleports me back to where I started it, the game treats it like I had never used it in the first place so no damage dealt. It also sometimes ends mid charge but my character and the camera keep moving on my end but I take damage from enemies hitting me where it stopped. In both cases the character usually keeps running until I use another ability. (The Return to where you start node was not allocated, I also only tested this with Dark Rush being allocated)