It was the 84th minute and Arsenal were clinging onto a slender 1-0 lead over a Norwich side inspired by the threat of relegation. Arsene Wenger had one substitute left and appeared to use it wisely.
Defensive midfielder Francis Coquelin stripped down and moved towards the touchline, the board went up and Alexis Sanchez's number was called.
The Chilean had struggled throughout the game but had, as usual, run himself ragged trying to make a definitive contribution. Coquelin would add more defensive stability in the final minutes, making it a natural move for Wenger to make.
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But Sanchez was having none of it and stormed straight down the Emirates Stadium tunnel, never to reemerge. Fans were quick to wonder if their star attacker had picked up an injury, but it appears that he was simply throwing a classic hissy fit.
Wenger confirmed that Sanchez went down the tunnel out of dissatisfaction but appeared to shrug off the suggestion that he would be reprimanded for such a move.
He told reporters: "Of course [he was not happy], I know Alexis very well, for a long time now, and he wants to play every minute. But what's important is the team wins. The win was much wanted, needed and difficult.
"My job is to make decisions, and to make people 100 per cent happy there, as well, is very difficult."
(Credit: Sky Sports)
Unsurprisingly, Sanchez's show of discontent was not the first time Wenger's judgement was questioned during a nervy 90 minutes. Danny Welbeck was brought on for Alex Iwobi in the 56th minute, causing ferocious booing from sections of the crowd, who, we suspect, wanted Olivier Giroud withdrawn instead.
However, the move paid off with the two strikers combining to score Arsenal's only goal of the game just three minutes later. Giroud, who had a poor game otherwise, put his hand to his ear and looked towards the crowd.