When do you LB in DF EX? (DPS)

[PyurBlue]

If LB ever gets the final blow, that means it's been wasted.

Using LB as a finisher can be a DPS increase because of the animation lock. LB damage is dealt before the player can move/cast again, unless they're interrupted (you can use rescue to pull someone out of the animation once the cast is finished to increase DPS). LB used as a finisher gets around this because the fight ends as soon as the boss dies. In practice there will be some waste because no one will be able to time it perfectly, but with some practice you can get pretty good at judging the correct time for a finisher LB. The other benefit to a finisher LB is that healer LB3 is always available as a recovery option.