Going by his ear
I first thought you mean that instance where Fury was sticking his tongue out as if he was licking Wilder's ear during a clinch. I can't remember what round that was. It's kinda gross to watch 
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I guess his balance took a major knock. If that is true it was a proper show of toughness.
It was hard looking at Wilder even in the first three rounds. It looks like he was always dragging his feet and ready to fall anytime. Wilder tried to survive but he just doesn't have anything left. Fury was clearly the more technical and smarter fighter and he showed that in both fights.