The elite skill Create Opportunity (498024) from Rogue/Mage does not work properly since according to the skill description (and as it was some time ago) the buff 503267 which can be caused by Create Opportunity (498024) should stun the target for 4.0 seconds. Now, the target gets stunned by 503267 for 0.0 seconds so in fact not at all.
That means that the Buff Time of 503267 is wrong and needs to be fixed.