Just a thought as I am now having to hold off leveling up my last 4 heroes just to be able to complete the daily task to get full rewards each day. If they allowed the ETR to trigger level up it would remove that problem for a very very long time.
How could you even miss hitting your enemy while your enemy has been stunned? What are the chances of that happening? What are the chances that anyone who is doing the algorithm of this game not have any common sense at all? Fix it ASAP, absolutely ridiculous!