WowAce

What steps will reproduce the problem?
1. The cast bar of "feud" ( http://www.wowhead.com/spell=88872 ) ability of chimaeron 10hm (while having him as a target) disappears after (approximately) the first 5 seconds instead of being displayed the whole duration of the spell. Here a video where you can see that problem at 2min27sec.: http://www.youtube.com/watch?v=IhyaACAOAyY&feature=player_embedded )

2. This problem does not happen on chimaeron 10 in normal mode. In normal mode the cast bar is left until the end like it has to be. (here you see that there is no problem in normal mode: http://www.youtube.com/watch?v=lRzztZFv5Wk&feature=player_embedded )

What is the expected output? What do you see instead?
nothing

What version of the product are you using?
3.33

Do you have an error log of what happened?
no

Please provide any additional information below.

edit: it's not 2:27 in the first video but 2:57

The differences for Heroic Chim are the following:

He does not fued, after he begins to fued Nefarion will yell at him to stop fighting, thus fued stops casting and he resumes attackig tanks.

There is now a DoT that will slowly kill your raid after he pushes into Phase 2.

So this is not the add-on failing it is simply a mechanic of the boss fight.

I was about to post that yesterday, but got distracted.

In any case, Triggirhape is right. The cast is actually interrupted, and Chim resumes attacking.
There just is no cast to show anymore.