Originally Posted by
SpookyGhost
Flash for pacification is only useful when you don't know the fight yet. IE on Bismarck you usually ended up pacified before the dragons spawned if you used it during the burn phase, but once you knew that was a thing you could either just manually click off Berserk or time it sooner to prevent the bad timing from happening.
Flash is most useful in fights like AS2 where having a 360 0 TP/Wrath AOE can make certain phase's adds easier to pick up.
Otherwise, though, Awareness or Second Wind are better options.