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Is this a mechanic or bug? After the vomit cone, my abilities are all disabled for maybe 10 seconds. Not the usual gray but half black half else, looks like a visual glitch (Im using advanced ui addon). I can move but cannot block.
If you're hit by the vomit cone, then you will channel one for a little bit, and your skills will be locked as you described. If another player gets hit by the vomit cone, and you get hit by their vomit cone in turn, then the same will happen, just in case you notice it happening well after the boss has channeled it.