A video taken by a member of the grow appears to show the moment that caused the chaos that ensued following Turkey's dramatic win over Czechia on Wednesday.
A mass brawl broke out between both sets of players following the full time whistle after Turkey snatched the victory in the 94th minute.
The 2-1 victory set up a last-16 tie with Austria for Turkey while Czechia were eliminated after finishing bottom of Group F.
The final whistle did not signal the end of the action, as players from both sides confronted each other in ugly scenes and Tomas Chory was shown a straight red card for pushing Ferdi Kadioglu.
And Chory's anger has become a little more easy to understand after some telling fan footage emerged.
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Kaan Ayhan sprinted half way across the pitch to celebrate right in front of Tomas Chory
Galatasaray defender Kaan Ayhan can be seen sprinting half way across the pitch to celebrate right in front of Chory.
Ayhan performed a knee-slide before pumping his fist right in the face of the forward.
It was a game that saw two red cards and a record-breaking 18 yellows shown.
Czechia made things hard for themselves when midfielder Antonin Barak was sent off inside 20 minutes for two bookable offences.
Chory (3rd right) was shown a straight red card by the referee as a mass brawl broke out
However, they held their own until the 51st minute when Hakan Calhanoglu put Turkey ahead with a fierce strike into the far corner.
Soucek scrambled home an equaliser 15 minutes later to give his side hope, but the Euro 2020 quarter-finalists saw their dreams of repeating that run ended deep into stoppage time as former Everton striker Cenk Tosun netted the winning goal.