In a season where Liverpool thought they had seen it all, this was to be the most extraordinary moment yet.
With Liverpool's hopes of a top-four place set to fade away at The Hawthorns, up came Alisson Becker for a late, late corner.
Just seconds were left on the clock when the goalkeeper ventured up the other end of the pitch in search of a goal.
By now, you will already know what happened next.
The first goalkeeper to score in Liverpool's 129-year existence, Alisson 's last-gasp intervention was the moment of the season.
During a taxing, punishing campaign that has taken so much from Jurgen Klopp's side, this was the antidote to it all.
One glorious, near-post header and Liverpool's Champions League dream was revived.
They are not over the line yet, but Alisson's Roy-of-the-Rovers moment will ensure a sprint to the finish this week.
But what followed next was perhaps even more heartening from the Reds' perspective.
An emotional Alisson delivered one of the best post-match interviews in some time when he opened up about a testing time in his life.
"I am too emotional - this last month - everything that happened with me and my family - but football is my life,” he said to Sky Sports.
“I have played since I remember as a human being with my father. I hope he was here to see it. I am sure he is celebrating.
"This was for my family and for the boys. We fight a lot together and we want to get to the Champions League. We won it in 2019 and it was all because of qualification.
"I hope my father is watching and celebrating somewhere. I am really happy - thank you for the players as we fight a lot.
“We are exhausted from this season - there has been a lot of pressure - I am happy for the win.”
Prior to becoming just the sixth goalkeeper to score a goal in Premier League history, it had been a mixed 2021 for the Brazil star both on and off the pitch.
Back in February, as Liverpool were in the middle of their worst run of Anfield form of all time, Alisson's father tragically passed away.
Liverpool, understandably, called for the Becker family's privacy to be respected as the No.1 came to terms with the sudden death of a parent thousands of miles away from his home.
Unable to travel to back to Brazil, Alisson didn't attend the funeral and was instead comforted on Merseyside by his wife, Natalia, who was heavily pregnant at the time.
The tributes poured in from all corners of football as Alisson received letters from Manchester City and Everton expressing their condolences.
“I would like to thank everyone for the messages and tributes to my beloved father,” Alisson wrote on social media.
“Our family feels loved by everyone! God bless each one’s life!”
Earlier this month, Mrs Becker gave birth to a boy named Rafael, as the Reds' goalkeeper welcomed the arrival of his third child.
"He went down in history, again." she posted on Instagram on Sunday evening about her husband. "Making the difference.
"Your faith, your usual humility, your commitment, your righteousness, your responsibility and conduct in the midst of pain, your heart was being seen, your tears collected by a God who is faithful and takes pleasure in rewarding his beloved children!"
The shot-stopper was mobbed by his team-mates inside the dressing room at The Hawthorns as the enormity of his contribution at the opposite end started to sink in.
The entire squad, one that was left stunned by the dramatic finish, watched the replays back several times on an iPad as a massive three points were celebrated in the away dressing room.
"How I said, if someone like Olivier Giroud scores this, everyone says it is a world-class goal," said Klopp in his post-match interview.
"When Alisson is doing it, you have to say the same.
"The way his team-mates showed today how much they like him is the best description.
"He is a wonderful, wonderful person and he is funny, smart, thoughtful, intense in moments, he is just a great guy.
"It couldn't have happened to a better person to have such a special moment with everything he has gone through, I am really, really happy for him."
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"It has not been an easy situation," added Liverpool goalkeeper coach John Achterberg. "But he believes his dad will watch over them – and that was the feeling with what happened.
"I had the same feeling, that his dad was watching over him."
One of the most liked members of the Liverpool squad, Alisson is a deeply religious family man whose quiet opinion carries weight.
Liverpool's players were delighted for their team-mate, who they recognise has been through a difficult period in his life.
"He's kept us alive!" said one senior Anfield source. "He is a winner. A top keeper and a top man!"
Now to Burnley, where it is hoped any Alisson interventions will only be needed inside his own penalty area.