Referee Guido Winkmann initially allowed the game to play on, denying Mainz a penalty, before blowing for halftime shortly thereafter.
Players of Mainz 05 and Freiburg were astonished when referee Guido Winkmann was notified by video referee Bibiana Steinhaus, who was watching in Cologne, that he should check a replay of a handball incident just before his half-time whistle.
The penalty was given for a handball by Marc-Oliver Kempf that the VAR noticed after the halftime whistle had blown. One Freiburg player could even be heard saying: "No, we're not coming back out".
And so, after a lengthy delay, the players returned and Pablo de Blasis opened the scoring for the hosts.
The curse of VAR struck again as chaos descended during Mainz's game against Freiburg in the Bundesliga.
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In the second half, an error from Freiburg goalkeeper Alexander Schwolow gifted Mainz a second goal when he passed the ball directly to Robin Quaison in the penalty area.
The game kicked off and, for 45 minutes, not a great deal happened.
Mainz fans protest the Monday night contest by throwing toilet paper onto the field.
The man in the middle then received a call from his video assistant, instructing him to check the incident.
The confusion continued after the break, as fans threw toilet rolls onto the pitch in protest against Monday night games, delaying the restart by several minutes.