L2J Server

Hello,
We have a big problem on our PVP server because High level daggerists kill low level players using Silent Move and the custom guards can't shoot them down..
Anyone could redirect me to the point in the core in which I could edit the protection on NPCs so they could see through Silent Move and just ignore it? Or Maybe someone could contribute me the code.

Thanks.

check where isSilentMoving() from L2Playable is used (L2AttackableAI, L2ControllableMobAI, L2FortSiegeGuardAI, L2SiegeGuardAI)

So I guess I need to remove the L2AttackableAI, I will check it later.. Thanks.