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Having just got Liverpool back on terms, he looked to really mean business — but then Arne Slot substituted him, leading to an exchange of words on the touchlines.
It remains to be seen if we are witnessing Alexander-Arnold's final few months as a Liverpool player, but he is clearly craving a truly blockbuster performance between now and the end of the campaign.
But like his close friend Jude Bellingham, the Liverpool vice-captain loves an "I'm him" moment, surely a prerequisite of an aspiring Ballon d'Or winner.
After his goal, Alexander-Arnold windmilled his arms at the crowd in the manner of Steven Gerrard, looking determined to turn the tide of the game almost single-handedly — as the old captain did so many times.
But you could tell from his expression that he was unimpressed, and Slot has revealed the conversation they had after the substitution.
"We spoke about this already a week ago," Slot said at his press conference.
Arne Slot, Dominik Szoboszlai, Trent Alexander-Arnold and Andy Robertson.
I said to him, "you know why I take you off, don't you?" and he said "yeah, yeah, yeah we spoke about it."
"Of course as a player he had adrenaline and had just scored
It was a better moment than when he lost the ball against Wolves just before I took him off, so he's improving!"
Alexander-Arnold only recently returned from injury, so it's no surprise to hear that Slot and his team have put together a pre-arranged plan for his game time