Man City were in total control before Patrick Bamford was allowed to roll the ball across the edge of the box for Dallas to rocket home.
It seemed that it could be Leeds' day with so many missed chances for Pep Guardiola's side already. However, a red card for Liam Cooper on the stroke of half-time meant the second half was heavily dominated by City.
With seconds remaining, a copy of the reverse fixture earlier in the season seemed to be afoot. Dallas, once again, had different ideas. The Northern Ireland midfielder, or full-back for the most part of Saturday's game, bulldozed his way past the City defence in the dying seconds of the game to slot past Ederson.
Leeds had snatched victory at the death.
A game of missed chances
City ended the game with 71% of the possession - not surprising after a Leeds sending off. With possession, came 29 shots, only seven of which were on target. This equates to 24% accuracy, a scary statistic for City fans watching.
Most of these shots came off the left wing, with Raheem Sterling taking several pop-shots from outside the penalty area - most of which rose far up into the stands.
In comparison, Marco Bielsa's Leeds had two shots with both on target - the definition of 'clinical'. Plus, with Leeds scoring the most goals from outside the box (12), it was no surprise to see it happen once again, especially with the lack of closing down from City players.
The loss to Leeds on Saturday meant City suffered their first home defeat against a promoted side in 42 Premier League games, since losing 2-0 against Reading in February 2007.
With 14 points still separating City and Manchester United in second, the Leeds game was not the important one on the calendar for most Citizens.
Champions League in mind?
Two Champions League quarterfinal legs against Borussia Dortmund sandwiched the league game, forcing Guardiola to make seven changes, and give key players a rest such as Kevin De Bruyne, İlkay Gündoğan and Phil Foden.
The resting of players meant Oleksandr Zinchenko started in midfield, and Nathan Ake was given his first start since Boxing Day, with the Dutch international out with a hamstring injury for the majority of the season.
Citizens will also have been happy to see Torres start, with the winger having a rollercoaster of a season. It seems that he has found his form when playing in a centre-forward role, scoring in five out of the eight that he has played in this position.
A weaker squad may have been the reason for City's downfall, with several of the players not up to full match fitness, but it is obvious that Guardiola was really set on the European competition instead, with City far ahead in the league standings already.
City fans will be expecting a big result midweek against Dortmund now, though.
It could have been even worse without the last-minute Leeds winner, which distracted many from the VAR decision in the first half.
Gabriel Jesus was left in a heap after Cooper followed through with a tackle on the Brazilian. The defender was originally given a yellow card for the foul, but VAR saw it as a dangerous tackle, leading to Andre Marriner showing the red card once going to the monitor.
With a lot of issues surrounding VAR since being introduced to the Premier League, many fans took to Twitter to speak their minds on what they thought on the decision:
Remembering Prince Philip
Just like every other team this weekend, the two sides observed a two-minute silence in memory of the late Prince Philip, who passed away on Friday at the age of 99.
The Duke of Edinburgh was married to Queen Elizabeth II for over 70 years, making him the longest-serving consort in British history.
At the age of 18, the prince joined the Royal Navy as a cadet.
He saw active service during the Second World War, serving in the Indian Ocean and the Mediterranean, and was mentioned in despatches for his bravery.
In addition to this, he did his fair share of charity work, supporting over 800 charities and good causes - focusing on his interests in wildlife conservation, technology and sport.
Prince Philip will always be remembered, and so the two-minute silence was a beautiful touch.