http://www.gamevee.com/viewVideo/Final_Fantasy_series/PC/FFXI__SapereAude__Absolute_Virtue/869546
Now... whats interesting about this video is the fact that the red bands actually do appear on his arm during the fight which i understood was him getting "locked" to where he is no longer able to use 2hrs. I dont know if this is just too obvious or what but i have an interesting question... has anyone ever tried the idea that noone in the alliance can have their 2hr up during the fight and that is how it is locked... I mean that could explain why in the video they all tend to use their 2hrs at the same time, because they tried to keep them all together so it would only do stuff every 2hrs when their 2hrs reset. So maybe the video isnt really saying save your 2hrs so that you can counteract AV's but it is actually saying burn your 2hrs whenever you notice that they are up.
Now in this fight because they were going for a kraken dark zerg it is very possible that everyone in that alliance had burned their 2hr which would account for the lock.