This is a scene of indescribable beauty. Between two horsemen, a marshal (90) facing right gives a signal of some sort with his upraised right hand. The left-hand rider (89) turns his muscular body and face, now broken, to a 3/4 view in order to look back. He wears a chlamys which falls behind his horse, leaving the tip wrapped around his right arm, with which he is reining in his horse.
His left arm hangs free against his horse’s haunch.