From the resulting free-kick by Jonjo Shelvey, Lejeune won the header, Gayle did brilliantly do hold off Smalling and flick the ball on to Ritchie, and the Scotland global - completely unmarked 12 yards out - slammed the ball low and left-footed past De Gea. "They gave everything they had and the gods of football were with them".
It was also a victory for his rival, Rafael Benitez, which lifted Newcastle, who had not won a home game in the league since October 21, out of the bottom three after slipping into the relegation places earlier in the day thanks to Huddersfield's 4-1 win over Bournemouth.
The Manchester United boss accused of his back line of failing to challenge Florian Lejeune for a header as he teed up Ritchie to score.
"I think it was a attractive way to win a football match the way they did".
O'Neill lauded the debutant goalkeeper's effort at the end and insisted that Newcastle deserved to get the win over Manchester United despite having luck on their side towards the end.
The midfielder has played a significant role further up the pitch for United this season, turning provider with nine assists while also scoring three times in just 16 appearances.
Granted, that might not have been the case since Sir Alex Ferguson retired, but the point is that little has changed in that respect since Mourinho arrived 18 months ago.
Writing in his column for the Times, he said: "United need a better mix there to keep the ball better, make them a better watch and more threatening, with better quality into their strikers".
This was second consecutive away match Mourinho substituted Pogba early into the second half, when the team was in losing position.
There were many things wrong with Pogba against Tottenham and again against Newcastle.
Smalling, defying his manager's orders and very possibly his own muscle memory, tried to dribble the ball out of defence and was booked for diving.
Speaking in his post-match press conference, the Portuguese summed up United's lack of attacking threat by saying they still wouldn't have scored if the game had been 10 hours long.
He said on Sky Sports: "No, no problems".
"We should look as hungry if not hungrier than them, that's no excuse for us. They have to become killers in the final third and they are not at the moment".