use purify weapon, they won't hit high if they are using square formation and will need many hits to finish, so your chances of getting a proc of purify are pretty big. i'd agree only if we were nerfing all other procs (sb, gof, purify).
Purify is what 3-5%? xbow seems like 25-33% l0l. You do the math
-1, i am demon archer, my stun is shit, and it misses 90% of the times on arcane armour classes, square formation is the only hope i have to maintain more than half distance from my opponent..., but yes i can see how it can be OP'd on a sage archer