In the middle of the tense Spain - Belgium match, a large portion of the 70 spectators in the stadium started cheering.
Not because Mikel Merino, once again, had secured the victory for 'La Roja'. Not even after Lamine Yamal had excelled on the left wing.
The only reason for this collective outburst was the appearance on the giant screens of Lamine Yamali's brother, Keyne, who will turn four in September.
"The child was not doing anything unusual, except making a funny face," L'Equipe wrote on Tuesday.
Yamal has talked about the situation with his younger brother.
"I was at the physiotherapist's when he called me from my mother's phone to tell me he was going to stick his tongue out," Yamal said.
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Yamali with special appearances and statements before the match with France
But why his presence in the semi-final match might not be good news for France.
"Once he's there, Spain wins. We saw him at the European Championship and since then he's become our lucky charm," Ben Fernandes Santos, a Madrid-based journalist, told L'Equipe.