public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(PRESSED(KEY_FIRE)) {
        if(GetPlayerWeapon(playerid) == 4) {
            new
                Float:X,
                Float:Y,
                Float:Z,
                Float:hp;
            GetPlayerPos(playerid, X, Y, Z);
            foreach(Player, i)
            {
                if ( gTeam [ playerid ] != gTeam [ i ] )
                {
                    if(IsPlayerInRangeOfPoint(playerid, 2.0, X, Y, Z))
                    {

                        GetPlayerHealth(i, hp);
                        SetPlayerHealth(i, hp-5.0);
                    }
                }
            }
        }
    }
    return 1;
}