The players had just ventured down the tunnel and into their respective dressing rooms for half-time when the referee, Guido Winkmann, suddenly ordered them all back out onto the pitch.
Mainz were rewarded with a penalty when the players had already left the pitch for half-time.
Pablo de Blasis scored one of the most remarkable goals in Bundesliga history - during the halftime break - as Mainz beat relegation rival Freiburg 2-0 amid fresh protests against Monday night games.
Speaking to Eurosport at half-time, Jochen Saier said: "It leaves a bitter taste".
Kleindienst, on as a half-time substitute, almost equalised with a header at the right end moments later but the visitors were made to pay in the 78th minute.
Make Way for Kylie Jenner and Stormi in Their New Fendi Stroller
Jenner flaunted her post-baby bod in a Fendi '90s Toweling Terry bodycon minidress in the brand's iconic print. Kylie used a custom filter over a Snapchat video of the road to congratulate her sister.
Guardiola: Man Utd can still win the title
In football, in sports. "Never before in the National Basketball Association had one team in the final recovered from 3-1 down". That's according to Paul Merson, who reckons the Manchester City boss is to blame for City's recent woes.
Searchers Find Woman's Body in Eel River
The 31-metre drop killed the women, both 39, and their children Markis Hart , 19; Jeremiah Hart , 14; and Abigail Hart , 14. Initially, Allman said the body was that of a child but the sheriff's office later corrected that it was a woman's.
A mistake from Schwolow in the final minutes allowed De Blasis to seal the home side's first win since January. Die Breisgauer have dropped into the relegation play-off spot - 16th - due to their inferior goal difference.
"But for us who try to attend every game in the stadium it's quite hard to travel on Monday to a match".
He added: 'We were under the impression that when the referee blows for half-time that's it'.
The second half was then delayed by fans throwing toilet paper onto the pitch, which was not related to the penalty decision but instead a protest against Bundesliga fixtures being played on Monday nights.
Premier League clubs have voted against introducing VAR technology for next season, preferring to continue with tests. I can't understand why referees are involved in the decision-making process at all, if it is to be used for clear and obvious errors, surely the VAR has to tell the referee what the decision is.