Mate, Guiata slid toward Jota and raised his hands to make himself big. Then tried to pull out of the challenge and his hands were moving down trying to pull away.
You are watching slow motion as if it's real speed, mate. The whole motion happened in a fraction of a second while the keeper was sliding. You try to do what you think the keeper should have done right from your perspective on wet grass and tell us how it goes.
I get what you're saying to an extent about slow motion and real speed, but that doesn't change the fact that Guaita slid towards Jota and not the ball. Also, yes, a GK can make himself big, even on a wet grass, by staying on his feet crouching down and arms up, I don't understand sliding towards the opposition player and going as close to the attacker as he did and then clattering into him. He was asking for trouble. If an outfielder slides outside the box, whether the grass is wet or not, missed the ball and got the man, wouldn't it be considered a mis-timed challenge and hence be called a foul?
People are saying we'd be complaining if that was given against us, I don't know about others, but I personally would've resigned to it that Alisson was asking for trouble if he went sliding like that onto an opposition attacker. And for the record, I think Alisson would've dealt with that better, I'm not a GKing coach or anything, so in my uninformed opinion, by just watching Alisson, he may have crouched down, but keeping himself big with arms up and closing down the angle, but not too close to the attacker and then try to nick the ball at the right time as he has done so many times when attackers tried to go around him. If the ball went past attacker, he'd have just jockeyed to see if the attacker can get to it and square to someone and if he had no options, he'd have let the defender deal with him.
Pulling away his hands means zilch, when he was out of control and his knees had already clattered into Jota and Jota was falling down. If I stick my leg out and trip someone and pull my hands back, would I be let go, without a foul?
I certainly don't buy into this, 'oh poor Guaita, he had no other option, he had to slide and take out Jota!'