Mainz defeated Freiburg 2-0 in a huge Bundesliga relegation battle game on Monday night.
Play had been allowed to continue after Mainz's Daniel Brosinski struck a shot that hit Freiburg defender Marc Oliver Kempf on the hand, but Winkmann watched the incident again pitchside after being notified by video referee Bibiana Steinhaus.
He ordered the players back onto the pitch much to the bemusement of Freiburg coach Christian Streich, who was seen shaking his head in disbelief.
There was a further 10-minute delay before the start of the second half as fans threw hundreds of toilet rolls onto the pitch in another protest against Monday evening matches. He then awarded the hosts a penalty after having to recall the entire Freiburg side and a handful of Mainz players who had left the pitch.
De Blasis scored a second goal on 78 minutes to secure victory for Mainz and move the club above Freiburg on goal difference -both sides now sit eight points clear of automatic relegation. Hence, Mainz took a 1-0 advantage into the break.
"We thought that when the whistle goes for half-time, that the first 45 minutes are ticked off", Saier told Eurosport.
The hard introduction of the Video Assistant Referee system (VAR) into football took another farcical step on Monday night with yet another hugely controversial incident in a Bundesliga match between Mainz and Freiburg. It's been used throughout the Bundesliga this season and has been tested in the FA Cup this term.