Either of two cases, the touch was heavy and he wasn't sure if he would get there OR it was premeditated so no matter what he was going to look for contact and go down.I would have to ask why on earth would the attacker dive there? He's round the keeper with no defenders, it would have been an open goal.
As a keeper if you come that far out and don't get the ball you are in serious, serious trouble.
But why then wasn't the YC converted to a DOGSO red?
Looked like a classic example of holding, starting outside the area and continuing until the player was inside, to me.The other big controversy was the penalty overturned because VAR said the holding was outside the area. It looked like the defender still had a hand on Sterling as he crossed the penalty area line.