User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5489419-20121010120650/@comment-190.215.193.216-20121010160142

Well, they're not "simultaneous", nor do they deal double elemental damage. It's just that each sword has a different element. Sounds cool, right? Turns out it's useless. You'd be better off having 2 sword with a single element (the one the monster is weak to.)