The bug: Warwick's Q, even without being held down, makes him completely immune to all forms of crowd control. Stuns, knockups, silences, everything is cancelled if it hits him during the bite dash.
Now i read this was going to apply to his ultimate, but i think it may be unintended for his Q.
Steps to reproduce:
Have an enemy champion (f.ex Nami) throw their disable at you, and use your Q on them just as it hits you.
You will take damage, but you will not be crowd controlled.