What about the right hand from joshua right after he knocked Ruiz down? It was a huge right, totally made a thud noise and whipped ruiz's head like it was gonna spin 360 degrees on his shoulders. Joshua stepped into and it landed perfect and Ruiz wasnt phased in the least! I swear it would have decked ANYONE else including joshua himself.
To land a punch like that and see it have no affect I think was the beginning of the end for AJ mentally. His ego couldn't take it and he'd rather go down with the ship than having to resort to jabs and smart boxing against what he considered(wrongly)a fat out of shape nobody.