Hey, being reborn is great =) Anyways, like Sk0rPiOn said, you have to attack if you want your guard to attack. That's why some trojans put 20 points into spirit (don't put any more than 20!) and buy thunder from the pharmacist at the market. You can then "zap" monsters and your guard will start to attack them.
As of now, there are certain maps where your guard won't attack even if you do. These maps include AC, TC, and PC if I'm not mistaken.
At level 70, you can equip a low level bow if you want to attack monsters from far away (this is useful if you don't want to put 20 points into spirit).
Hope that helps