I really like the idea that Ahadi and Scar never really liked each other.
Story resume:
Since Mufasa were a young cub, Ahadi taught everything he knew. Uru was wise and she taught the cubs about the circle of life, Ahadi who valued brute strength and agility taught Mufasa to fight and kill.
But Ahadi, only taught Mufasa, and left Taka behind with his mother. Taka always wanted to spent time with his father, like Mufasa. One day, Uru saw her son was sad, and decided to convince Ahadi to spent the whole week with Taka, teaching and playing with him.
So, Ahadi began to spend more time with his son, and he liked it, soon the 2 were already very close. But one day, Scar disobeyed his father and wnet with Mufasa, Sarabi and Sarafina to the elephant graveyard. They were almost killed, and Mufasa broke his leg when they were escaping. Fortunately Ahadi arrived on time and rescued the cubs. As they were returning home at dusk, Mufasa and his friends returned home, and Taka tried to talk with his father who was angry. Ahadi got nervous and attacked Taka, leaving a huge SCAR on his eye and heart.
Characters and Original image (C) Disney