For sorcerers doing this fight online: besides your usual PvP setup, you gotta nuke the first guardian with crystal spears. If everything goes right it's gonna be a 1v1 until the second one arrives. If the other guy is bad he's gonna be dead before she can help, if he is decent your best bet would be running around trying to nuke the second one with crystal spears again. It's pretty tough because you won't have a lot of time to cast, but there is no way she is dying with homing soul mass while the guy is charging r2's in your back. So either try that or do your best to win 2v1. If it gets too infuriating (it's really tough doing PvP while getting ganked 'cause you can't cast***** and if you're a mage you die easily) either summon someone else or switch to offline.