If you are double jumping shelves, you need to wait. Skipping any pylon will cause the shield to bug.
We've tested this theory extensively, and unless its been luck 100% of the time, this seems to be the fix.
They are referring to the big pieces dropping on soa in p3 to remove his shield I believe. Our tank would position him under it on his screen yet he will be a bit off for others and the rock will miss. If jumping down in order somehow relates to his shield not coming off in p3 when you drop something on him that could be some interesting info though.