Here is a link to Prologue from Youtube
It makes harrowing watching but is simply remarkable in terms of anatomy and action as well as in the pre mastery of camera moves. The is exactly what Hitchcock’s “Rope” should have been like- a constantly wandering camera lens picking out detail and following the action. I love the way, though that Williams does two things- a) the final man standing is so absorbed in his victory that he and us do not see the last attack and b) I love the fact that all this is actually observed by a girl we never see until the end. She runs off to her grandmother-0 another figure we never see on what otherwise seems to be a flat open plain. It is entirely magical.
animate-tim.com 
Art Babbitt, who was working for Williams at the time, described his employer’s talent: “He’s a director, designer, animator, and has a good layman’s knowledge of music. He’s a dreamer. He has more to learn as far as animation is concerned, but God, he can draw like a bastard”.