function	script	F_itembonus	{
initnpctimer;

OnTimer1000: 
if (Hp < (MaxHp/2))) {
    if (!@it_bonus){
      bonus2 bSkillAtk,"KN_BOWLINGBASH",100;
      @it_bonus,1;
    }
}
else if (@it_bonus) //turn off bonus ?
initnpctimer; //looptimer
end;
}