Mine

for (L2MonsterInstance mob : _knownList.getKnownMonsters())
        {
            if (mob != null)
            {
                Point3D posMob  = mob.getWorldPosition();
                Point3D posMe   = getWorldPosition();
                if (Point3D.distanceLessThan(posMob, posMe, 80)
                        && getHeading() - Math.atan2(posMe.getX() - posMob.getX(), posMe.getY() - posMob.getY()) < 40)
                {
                    
                }
            }
        }