Russell Martin had seen enough before half-time during Southampton's 5-0 loss by Tottenham on Sunday.
The Saints manager stormed off the pitch and into the dressing room at 4-0, only for James Maddison to complete his brace in the fourth minute of additional time in the first half to make it 5-0.
The loss ultimately proved to be the 38-year-old's last in the Saints' dug-out as he was relieved of his duties shortly after the result, with the side languishing at the foot of the table with just one win from their first 16 matches.
Post match, Martin rued his side's mentality after conceding the opener, explaining that they did not do enough to fight back from being 1-0 down.
'Well, I'm hurt with the first half, we just don't respond very well to setbacks as a group. Ultimately, it's hurt us a lot this season,' he said.
'We concede so early, and we have a chance to foul Djed Spence in the middle of the pitch, and we don't, and then we're 1-0 down, and then the response after that is incredibly poor. So yeah, very disappointing.
'Yeah, I think it's probably the most disappointing thing is we have a plan that I love the week's training. The players have been a part of that, been part of that process, but we don't carry it out of anywhere near enough intensity aggression are because we concede that literally the first action they have the ball.
'So then that's down to like mentality and still wanting to stick to it. So I didn't recognize the team in the first half. I'm pleased they stuck at it in the second but, yeah it's a tough night.'
When asked about the quality of the home support at St Mary's, he defended the fans, despite many of them leaving the stadium after just 25 minutes, as Southampton trailed 4-0 early on.
'[The fans] were amazing. Second half, they were amazing. Really good,' Martin said.
However, the Englishman noted that the boos ringing around the stadium were unconstructive for both him and the players, but insisted he was not offended.
'As a person? No, because I understand it's not personal, so I don't know them and they don't know me. As a manager? Yeah, of course it hurts me. It hurts the team. I also understand it,' he added.
Unfortunately for the former Swansea boss, his 18-month spell on the south coast came to an abrupt end just hours after the defeat.
In a statement Southampton said: 'We can confirm that we have taken the difficult decision to part ways with our Men’s First Team Manager, Russell Martin.
'Going into the start of the season, we all knew the challenges that we would face this year as we readjusted to life in the top flight, competing in the best and most competitive league in the world. However, the reality of our situation is clear.
'The board have supported Russell and his staff and been open and transparent regarding our expectations. We have all been on the same page in recognising the urgency of needing results to improve.
'We would like to take this opportunity to thank Russell and his staff for all the hard work and dedication they have given the club on and off the pitch over the last 18 months.
'Everyone connected with Southampton FC will always have fantastic memories of last season, especially the Play-Off Final win in May. Current Under-21s Manager Simon Rusk will take charge of the team on an interim basis until we announce a permanent replacement.
'Behind the scenes, we are encouraged by the continued development of talent coming through our Academy. We are proud of the contributions our young players are making and are confident this will remain a source of strength and pride for everyone associated with the club.
'We are also deeply grateful for the continued support and positivity shown by our fans. We are witnessing first-hand the significant gap between the Championship and the Premier League, but your understanding and passion, even when results have not been what we all want, continue to drive our long-term commitment to the club'.