just wanna share my tactics:
beating up a mage with blizzard/sleep: use sleep. very fast casting speed. advantage to SM, SM's sleep time is longer than a mage's which hits lvl 20.mage wont be able to touch you, unless one of your lock chain fails.
beating up a foiler: *assuming enemy dont have beholder.hide as soon as the duel countdown starts; which is before the foiler starts to foil you.and when the opponent hides too, its your chance. he wont be able to detect you without beholder. but you got non target aoe, sword storm. as soon as the person got hit, quickly aim him and BOOM. *thats the tricky part, its not that easy to quicly click on the target.