The 26-year-old Portuguese international's injury - a fracture dislocation to his right ankle which he will have surgery on Monday - occurred as his momentum from Son's trip saw him crash into Spurs defender Serge Aurier.
Not one, not two but three VAR penalty decisions led to unnecessary stoppages - one ridiculously of more than three minutes - that would been rectified far more quickly and accurately had the referee simply taken a quick glance at the pitch-side monitor which, throughout the Premier League season, has been inexplicably rendered redundant and replaced by VAR officials in a studio hundreds of miles away.
"This is a bad moment for us and our team - this was more than a football game", he said.
"I didn't want to look too much at what happened".
"The feeling changed at that moment". Son is one of nicest people you've ever met.
Replays showed Alli had handled a cross in his own area under pressure from Yerry Mina but after an examination in Stockley Park that lasted three minutes and 13 seconds, it was not given and it led to a darkening of the mood.
The Premier League explained: "The red card for Son was for endangering the safety of a player, which happened as a effect of his initial challenge".
"This is a really serious injury and there are a lot of things that could impede recovery", he said.
While sympathy poured in for Coleman, the Welsh left-back was hung out to dry in many respects after a mistimed tackle that ultimately put a fellow professional out of the game.
A awful first half was hardly surprising given the form of both sides.
Everton midfielder Fabian Delph appeared to still be affected in a post-match TV interview when asked about his team-mate.
Alli was involved in a controversial incident soon afterwards when he challenged in the air and the ball inadvertently seemed to catch his arm.
"Players looked devastated and there was utter confusion - players with their heads in their hands", he said.
Son was sent off for the challenge after the intervention of VAR. Match referee Martin Atkinson was initially set to book the South Korean, though whether he would have been able to continue is doubtful given he was so upset about what had happened to Gomes.