He was talking about the adds, the off tank has to move in for shriek too so there is no way he won't be able to reach the add. Not to mention that is not far into the fight, and with correct CD usage his DPS should be still coming down from his raging rotation. There is no reason to have bad DPS at that point, and BLMs can carry the burst on the adds so a BLM that isn't bursting the deathdancers for whatever reason is just being neglectful of one of the few things he brings to a fight. You are not punished by shriek any more than any melee job, there are things you can do to mitigate it, you only have to move in you don't have to move back to position right away. I'm glad BLMs get punished by fights like this because they really need it slammed into them that they need to wait for GCDs to move whenever possible.