When Judar found out that his Goddess created another magi, that filled him with some much rage and jealousy at that Magi named Aladdin, he had all of your attention and affection. Then when he first met Aladdin, he challenged him to a duel to see who's better.. Aladdin won in front of you his Goddess, it was humiliating him begin knocked out by that Magi right in front of you made him feel unworthy of begin your Magi.. He feels useless.