Having reflected on this i would say the following.
The one fact that is being missed by everyone is that Ederson was the favourate to get to the ball not Mane, He was able to get his head to the ball without diving for it, If Mane had chosen to go with his head or chest the chance would have gone as he was never getting there first. As such he takes a gamble and lunges forward with his foot, he miss judged the challenge and was rightly sent off. He clearly saw he keeper and made the decision to go for the ball, once he did this he had to take the ball and the moment he failed there was no option but to send him off.
Just switch this one for a minute, If Mane had just clipped the ball past Ederson with his head and Ederson had come flying out of his area with a kung fu kick catching Mane in the face would it have been treated any differently?
You have to factor in the height of the challenge, the fact that the studs were showing, the fact that Mane was fully aware of Edersons position, the speed of the player when contact was made. All of these facts make the tackle dangerous and reckless.
It's funny how the line " I would expect him to make the challenge " keeps getting rolled out.
Lineker.
Shearer.
Wright.
Sutton.
All forwards and mostly ****s.