An elderly, weak lion now lay in a cave all alone, living his last days. His teeth were loose and weak and his limbs were all slow and slim. He could not hunt for himself now and had lost loads of weight.
Seeing him in this state, a wild boar came up to him and hit him in the stomach with his sharp horns. A bull approached the lion too only to stomp all over him and an ass came by too, only to hit him in the face with his hooves.
But such foolish acts these were. It is cowardice to attack the defenseless, even if it is your enemy.