5 Reasons why Braun Strowman assaulted Brock Lesnar's advocate, Paul Heyman on WWE RAW 

#4 Braun Strowman was supposed to face Lesnar at The Royal Rumble

Braun Strowman was the original opponent for Lesnar at the Royal Rumble. But because he chased Baron Corbin all the way to the parking lot on the January 14th Episode of RAW, and ended up destroying Vince McMahon's limo, he was stripped of the opportunity. And one must imagine that he isn't very happy with the decision.

And therefore, much of his ire must be directed towards Lesnar by proxy of Paul Heyman. Maybe this is his way of reminding Heyman that Braun Strowman is still a threat to his client. Maybe this is his way to entering the Universal Championship scenario once again.

Strowman's physical attributes will always ensure that he remains a top guy for the period that he remains in WWE, despite the ups and downs. I suppose he's on his way back to the top of the mountain once more.