#3 Rivalry with Braun Strowman
Braun Strowman is one of the strongest men in the world. Though his initial push wasn't great, they always showed him to be a huge threat.
He really started to come into his character after the Superstar Draft split him from the rest of the Wyatt Family and he started doing Squash matches.
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For months they built him up against Jobbers, Kalisto, and Sami Zayn, but no real competition like he demanded.
Finally, they put him against Reigns and the result was...frustrating.
It's basically a rule from Vince McMahon that everyone has to make Roman Reigns look "strong."
It was a complaint of CM Punk after leaving the company. So it gets difficult when you have a man that according to Physics shouldn't have a problem taking on Reigns and keep pushing the smaller man as the stronger man.
The Monster Among Men proved his strength on multiple occasions including flipping an ambulance that Reigns was supposedly inside of and tossing his stretcher off a ledge like it was empty.
Every time Strowman would do something that was awe-inspiring, fans would find how Reigns actually snuck out before taking any damage.
This was topped off when Reigns drove the ambulance after their Ambulance match backstage and backing it into a production truck to try and kill Strowman.
Come on, he couldn't have been thinking "this will take him out of action for a month." If you have a wrestler doing what Reigns did, the intention must be murder which is a really weird way to get us to cheer for him.
"Yay, Reigns murdered Strowman?" No, this just got him more boos.