What to glean from a game in which most observers needed the comfort of a dark room to lie down in afterwards?

This was a pulsating encounter with the narrative changing entirely as the minutes ticked by.

With Alfredo Morelos off and Celtic dominating the game, there was a stage of this game in which it seemed like a case of how many from the Parkhead side’s point of view. That sense of coasting along was rudely interrupted by the very different Rangers side who emerged after the break but the actual game itself was in danger of being lost amidst the merry mayhem that came to the fore at the final whistle. Here are five things we learned:

This game will forever offer up controversy and intrigue. It is a curious phenomena that the ugly scenes at the end of this game simultaneously repel as well as fascinate – it is part of its considerable draw. But the one thing that you can learn from this meeting is that whatever anyone tells you in the build-up to this game, there is nothing forgotten in the aftermath of a win for either side. Celtic waited three months to atone for their limp defeat at Ibrox and the melee that came at the final whistle seemed to be the culmination of personal battles and lingering slights as the Parkhead side settled a score. Which means that the final game between the sides this season is likely to come as near to the end of the season as possible in order to give some breathing space after the latest spectacle.

Scott Brown is a clever fisherman but there is an accusation to be levelled at the Celtic captain that he has bought into his own hype. Brown was cute with the clip of the heels that inevitably provoked a hot-headed response from Morelos who gleefully gulped down the bait and there is a strong argument to say that Ryan Kent should have followed Morelos up the tunnel. But was there a need to goad a small band of visiting supporters? As hostile as a bag of angry vipers by that point after seeing their team rally and then fall on their sword – it is the hope that kills you – Brown’s celebration in front of them sparked the barny that followed as Andy Halliday took exception to the goading of the visiting support. All entirely unnecessary.

Odsonne Edouard is worth every bit of the £9m that Celtic paid for him. It has been a difficult season for a player who is still only 21, but there is something about the temperament of the Frenchman that gives him big-game status. He did not only score a fine opening goal but set up James Forrest for the winner and lead the line with considerable aplomb yesterday afternoon. The striker was the best player on the park - the offical man of the match award was given to Brown - but it was Edouard who was the main man for the Parkhead side with a mature and elegant performance as he lead the line.

Kieran Tierney needs time out. The fullback was done in yesterday by the time the game approached the hour mark and there must be some concern about the nature of the pubic problem that has wrecked havoc on the latter part of his season. The Scotland internationalist was a doubt before the game and played through but his movement was ginger and seemed restricted before he had to drag himself off the park in the second period. If rest is the only cure for the problem it would seem sensible to sit him out now.

The jury is still out on whether Neil Lennon will get the Celtic job on a permanent basis. In those swashbuckling early stages as Celtic threatened to run riot, there wasn’t a dissenting voice. But as Rangers came back into things and the hosts toiled to dominate, there were more than one or two who voiced their disapproval. Lennon’s record since taking over from Brendan Rodgers stands up to scrutiny with four wins – big wins – and one draw but there remains a lingering question mark over whether or not he will be given the role after the summer.