Wallin pointed out Joshua's major mistakes in his fight with Dubois

"I was surprised by Joshua's approach to the fight. I think it was a combination of factors. I thought it was strange that Joshua kept his hands so low, especially with a guy like Dubois who is a heavy hitter. Also, he was holding his chin high, and that's kind of weird.

I think Dubois really caught him off guard and knocked him out. From the starting gong, Dubois didn't let Joshua get into the fight. He shook him early and kept fighting that way. It seems like Joshua was shaken throughout the fight," Vallin said in an interview with YouTube channel Pro Boxing Fans.

Recall that on September 21, Dubois knocked out Joshua in the fifth round in the main event of an evening of boxing at London's Wembley Stadium.