FM: Yeah, but usually the last boss uses Black Hole after the first or second Big Bang, so Haste will only benefit you for a couple of turns. I guess it's better than nothing, but after Black Hole dispels Rosa's Haste, it's better to just use Cure 4 rather than trying to cast Haste again. Then again, I think one of Edge's blades (either Masamune or Murasama) can be used for casting Haste. If you can target characters other than Edge with the Haste effect, then feel free to use it on Rosa.