Since the turn of the year, Manchester City has appeared in supreme control over everything they have investigated.
They beat six past Chelsea and seven past Schalke; nine beyond Burton and five beyond Burnley, and more recently taken to win games without reaching the highest gear and maintaining energy.
In 22 games since Boxing Day they won 22, albeit one of them only after a penalty shootout in the Carabao Cup final in Wembley and only lost once in Newcastle.
Harry Kane could be set for a new long time on the sidelines after injuring his left ankle
Then this; escaped from their domineering step in North London as Tottenham opened the intensity and deceived them in a breathless physical competition.
Speaking on the eve of the game, Pep Guardiola noted the aggression needed against Spurs and added Fabian Delph's muscle to the left and another combative midfielder in Ilkay Gundogan, at the expense of Kevin de Bruyne.
Without the craft of Bernardo Silva, this meant for a long time that City was not like City, despite Guardiola's attempt to claim that his team controlled the game.
Perhaps they were distracted by an urge that Harry Kane launched.
Kane had to be helped off the field after the injury in the 58th minute on Tuesday
The irony is of course that Kane was injured when he arrived late for a challenge on Delph and twisted an ankle.
Mauricio Pochettino, however, can get a lot of satisfaction from a plan that the Premier League champions are rattling and gave Spurs the edge in the halving stage.
Nobody is going to write Manchester City, but the tie is alive and Tottenham has not given up an away game.
They learn quickly in the Champions League; think big and that is exactly what Pochettino demanded when he broadcast them on the front foot.
Kane set the tone for his team in the first five seconds, on the front foot and forced an error by Nicolas Otamendi.
The Tottenham striker turned his ankle on Fabian Delph's approach in the second half
The crowd of Spurs responded to the occasion by generating a fantastic roar and the ball boys around the field had a multi-ball task, quick to get their team to generate intensity.
It helped the Pochettino team to get the ball back into play quickly when it went out, and they worked hard to disrupt the visitors because they were sticking to their principles of ownership and leaving the defense and trying to break through quickly in the space behind the high-press.
City took 78 minutes – Ederson turned out to be an impressive presence with his cool handling – but they were never at their best on the ball.
They missed Bernardo – who will be fit for the second leg according to his manager – and it was late in the day that Guardiola launched De Bruyne and Leroy Sane.
Tottenham had something to defend on this point and was still inspired by a seething sense of injustice that resulted from the decision of the first half of the fine.
Nobody has criticized the referee system of the video assistant any fiercer than Pochettino. For him it gnaws at the spirit of the sport.
Kane was out for six weeks after injuring the same ankle at Manchester United in January
Even when decisions have gone such as in the first half of the Carabao Cup semi-final against Chelsea in Wembley, he consistently disputes development.
Ten minutes before Tuesday's game and his feelings were strengthened.
No one called for a penalty when Danny Rose threw his body over Raheem Sterling's shot, but the television replays saw the ball hit his elbow.
Manchester City had the chance to break through the rough atmosphere, but Hugo Lloris jumped to the left to defeat Sergio Aguero from the spot.
Lloris, captain of Spurs and world champion France, has been criticized for losing his focus this season, but the confidence of his manager was unwavering.
His savings that almost lifted the glass roof. It was certainly a factor in creating an atmosphere that brought Tottenham to the challenge and perhaps shocked the visitors.
They were shaken at Anfield last year in this competition, one evening when the team bus was attacked in the streets of Liverpool.
Kane feels the full power of a challenge from Manchester City midfielder Fernandinho
In fact, City has now lost all five games against English opponents in Europe. They were defeated in both years by Chelsea in the European Cup Winners & # 39; Cup in 1970/71.
Last season, when Spurs collapsed due to Juventus, Pochettino decided that they should improve their status and acquire the body language of a larger club if they were to become successful in the European competition.
He noticed how Juve's key figures in the tunnel were halfway through time, pressured the officials and responded in the last 16 to Borussia Dortmund by getting President Daniel Levy on the field before the kick-off.
Hardly had Lloris Aguero refused or Pochettino was over and shook his head to let the fourth official know his precise feelings.
Moments later, on the other hand, Kane and Dele Alli tumbled under minimal contact into the penalty area, looking for a way of recouping as 60,000 chanted, & # 39; V-A-R, V-A-R & # 39 ;.
Pochettino's pre-match rhetoric about Spurs & # 39; thinking big & # 39; the target in their new house seemed to have been hit and just as Manchester City seemed to have admitted for the first time in the game, they admitted their first goal since mid-March.
& # 39; The result is not the best, but in the Champions League you have to make this kind of comeback to make it through & # 39 ;, Guardiola said when his daring bid for a Quintuplet hit a hit.
It may not be terminal, but Tottenham will be encouraged. Pochettino's plan worked and he will re-deploy it next week. Others can also and the challenge for Manchester City is to restore their calm.
Son Heung-min helped his party overcome Kane's loss by beating Manchester City 1-0