The reported argument between Brock Lesnar and Vince McMahon during last Monday's RAW was apparently very heated as the two were heard "yelling and screaming" at each other.

The WWE World Heavyweight Champion left the RAW taping in a huff following a dispute with Vince McMahon, which most believe was over "The Beast's" next contract with the company.

According to Wrestlingheadlines.com, Dave Meltzer noted in his latest Wrestling Observer Newsletter that it's unknown what specifically Lesnar and McMahon were disagreeing about besides it being related to his next contract.

There was also said to be some concern for McMahon after the arguing grew to a loud volume.

Per the report, McMahon also assured people at Tuesday's SmackDown tapings that he wasn't worried about Lesnar not fulfilling his dates -- including WrestleMania 31 because he's contractually obligated to.

WWE officials are said to be very confident that Lesnar will work WrestleMania while there are reports that McMahon may have dropped a hint about suing "The Beast" if he didn't show up.

Lesnar was booked for last week's RAW in Nashville and he was supposed to be involved in a segment alongside his manager Paul Heyman and WrestleMania 31 opponent Roman Reigns.

Reigns, the 2015 Rumble Match winner, was fresh off of defeating Daniel Bryan at Fastlane to keep his No. 1 contender status for the gold.

Lesnar ended up walking out of RAW after the dispute, leading to Heyman and Reigns doing a segment without him.

There were rumors that when Lesnar's current contract expires he might return to UFC, but they have seemed to subside in recent weeks as he was in negotiations with the WWE about an extension.

Lesnar was seen at UFC 184 on Saturday in Las Vegas.

Lesnar has been on a part-time contract with the WWE and has had a dominant year, ending The Streak of The Undertaker at WrestleMania XXX and then dominating John Cena for the WWE World Heavyweight Champion at SummerSlam in August and has held the title ever since.

Despite the contract dispute, Lesnar is set to face Reigns at WrestleMania 31 on March 29 at Levi's Stadium in California.

What happens after that is anyone's guess.

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