Me and a friend have started recording and taking screenshots and I can tell you right off that with latency funny things happen. For example when watching a BS duel some guy we can see the effect of internal bleed on target while castbar is at like 80-90% (and both are perfectly legit players and not even Russian if you must know).
We will try to make a little compilation to show that but it would basically explain 90% of the vids here http://www.youtube.com/user/Brogar20?feature=watch