"The same desire for balanced composition determined the postures of the individual animals and humans in the frieze. The forms of the reversed animals in 53-55, 57, 58, for example, balance the outlines of the uprights heroes and rampant animals... Frequently, as in 53, 55-57, the human heroes are joined in their fight by a bull-man, who makes his first appearance in this age. It was thought by earlier Assyriologists that this bull-man could be identified with Enkidu, the friend of the epic hero Gilgamesh, while Gilgamesh himself was identified with the nude bearded hero with curls." Porada, CANES, p. 9-10
Horned animal between attacking lions, one of which is held by bull-man -- Gazelle reversed by hero -- Another gazelle reversed by second bull-man, who also grasps lion that initiates scene.