Currently the Guardian can do extra damage with the sword weapon. The chain skill: Sword of Wrath > Sword Arc > Sword Wave is the issue here.
How it is preformed: After landing a hit with Sword Arc, spin your character so that you are no longer aiming toward your enemy, Sword Wave will go off, not hit anything, however still deal damage to your target, HOWEVER not go back to Sword of Wrath. So you can turn around and land Sword Wave a second time.
Video Included.
http://tinyurl.com/owrjdtk