A West Ham United fan ran onto the pitch and inexplicably STOPPED his own side's counter-attack during a crucial part in the match.
At the time of the pitch invasion, West Ham were level with Lyon and pushing for a goal - with the team on the break.
Michail Antonio started the attack, but lost possession with Pablo Fornals eventually picking out Declan Rice, who returned the ball to the Spaniard.
It looked like a promising attack, with the hosts desperate for a goal. However, the move was stopped after a supporter entered the field of play.
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Match referee Felix Zwayer blew his whistle to halt the game, with the West Ham players' reaction summing up the situation.
Fornals and Ben Johnson fumed at the fan's decision to run on the pitch while Ryan Fredericks gave him a piece of his mind.
David Moyes also cut a frustrated figure on the touchline.
Speaking after the game, he slammed the person who ran onto the pitch.
"I was baffled," said the 58-year-old. "This is a really good football club doing so many good things.
"But those things tonight didn't help, we were on a counter-attack with an opportunity to score."
The Europa League quarter-final first leg clash ended 1-1.
Jarrod Bowen opened the scoring shortly after the break following the red card of Aaron Cresswell in first-half stoppage time.
Tanguy Ndombele, who's on loan from Tottenham, levelled the game in the 66th minute.
The Hammers travel to Lyon next week for the second leg.
Topics: West Ham United, Football, David Moyes
Nasir Jabbar