Firstly, glad ederson is OK. He showed great ability and balls of steel today for us.
Second, and I know most already agree it was red, but by the rule book it is endangering an opponent. He has to go. If ederson comes out, kicks high and missed the ball but whacks the opponent, he'd be off for either of dangerous play and denying a clear goalscoring opportunity.
I'm surprised it has caused so much debate to be honest. Yes, it changed the game, but it hardly spoiled it for the neutral I would argue. If anything, blame Mane for making the challenge. If he'd perfected it he'd have scored, he didn't and he almost caused a fractured skull. Not malicious, but certainly dangerous.