Well, i found this out and works, it's just a small l2j bug that can be usefull if you play on a rpg. If a mystic class uses a bow with SA cheap shot, it has a negate affect and you shot always (i think, it worked 5/5 for me, maybe it may not be 100%) with your magic for a 2 mp consumation!!! For a mystic, it is catastrophic (endless MP huh ;D) and if you are a bishop, you heal forever!!! Useful for RPGs and PvP servers (a bishop bot with endless heal for you ;) ). Use it at your own risk (if it is fixed by the server admin, but i don't think so, you will spend your adena/items for a useless bow). Try it first on the PvP (if this server has a PvP and a RPG try it first on PvP, and if it works, use it on RPG ;) ).