Seth Rollins broke one of Vince McMahon's 'secret rules' during a tag team match on RAW this week. 

The Monday Night Messiah was teaming with Murphy against Rey Mysterio and Aleister Black, but the match ended abruptly when Rollins was disqualified. 

A post-match beatdown followed, but many fans were still left wondering why there was an awkward finish to the actual match.

It seems it wasn't planned, with Rollins breaking one of McMahon's 'secret rules', forcing an end to the bout.  

On Wrestling Observer Live, Bryan Alvarez explained: "There is, in fact, a secret rule, it’s a Vince McMahon rule. 

"In a tag team match, you know how you tag and there are five seconds when you can both be in the ring at the same time, right?

"If I tag you, for five seconds we can both be in the ring. However, outside of that five seconds if you are not the legal man, you cannot touch the other team’s legal man.

"Vince is adamant that this is enforced. If you are legal, you are allowed to hit the other team’s illegal man but the illegal man cannot touch the legal man." 

Mysterio hit Rollins first

Sounds a little bit confusing, right? Alvarez went on to explain specifically why Rollins was DQ'd in this instance. 

"So Rey, because he’s legal, is allowed to hit Seth on the apron but Seth on the apron is not allowed to hit Rey," he continued.

"Seth can hit Aleister because they are both illegal. Legal can hit illegal but illegal cannot hit legal... but illegal can hit illegal.

Rollins was DQ'd for touching Mysterio

"Vince is so adamant about this rule that when the wrestlers put together matches, there are spots that they want to do but the can’t because they will violate this rule.

"If you are on the apron and you step inside and you punch the legal man, even though it has no bearing on the match, that’s a disqualification.

"That’s why last night Rey went for the 619 and Seth grabbed him and threw him on the floor and that was a disqualification. Because of this crazy rule."

Rollins fell foul of a Vince McMahon rule

It's all rather complicated even after that explanation, so it's no surprise that WWE stars sometimes fall foul of this 'secret rule' as Rollins did on Monday.

Why can't things just be simple, Vince?