Jurgen Klopp's reaction was spotted by eagle-eyed Arsenal fans after Pierre-Emerick Aubameyang grabbed the opener in the Community Shield.
The Gunners emerged winners after penalties following a 1-1 draw after Takumi Minamino's second-half strike saw Liverpool equalise.
But it was Mikel Arteta's men who triumphed, to mark a second trophy for the Spaniard following their FA Cup win against Chelsea.
And it was Aubameyang who was the main man on the two occasions, scoring in both matches.
His one against Liverpool was a beauty, as well, cutting in from the left flank before unleashing a brilliant finish past Alisson in the first half.
And even Klopp could not help but admire the strike from the player he used to coach at Borussia Dortmund.
The cameras switched to the German manager who gave a slight smile and a small nod as if to appreciate what he had just seen.
Arsenal would hold that lead up until the 78th minute when second-half sub Minamino grabbed his first goal for the Reds.
That would take the match to penalties but Rhian Brewster missed his chance to allow Arsenal to win the trophy.
And it was Aubameyang who stepped up to deliver the crucial spot-kick, tucking away the ball with considerable ease in an empty Wembley.
Though there are bigger tests than the Community Shield, it was another example of Arsenal's return to form under Arteta.
In the space of a few months, they have beaten Liverpool twice, Chelsea and Manchester City.
In times gone by, the Gunners may have crumbled under the pressure but Arteta believes his side show no fear when they meet the big boys.
“Two days ago we started to have players back in training and I didn’t hear one excuse,” said Arteta.
“‘Oh they (Liverpool) had two weeks in Austria, better preparation'. None of that.
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“When I was in the dressing room today I had the feeling they believed we could win. They didn’t feel any fear.
“They wanted to really go for it and believed they could win another trophy.
"And they showed from the first minute their courage and their passion.”
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