we were in possession, cancelo simply lost the ball and rugani got exposed. losing the ball like this will have consequences. i wonder what bonucci or chiellini would have done in the same situation, but usually it's the worst for a cb when he has to defend 1 on 1 against a running forward with a lot of space ahead of him. that goal is 100% on cancelo, no two ways about it.
btw it's not '68 anymore, defenders are not constantly man marking attackers. rugani did fine, he was the least of our problems yesterday. guys who are having a good season overall (like cancelo, cr or ds) performed much worse.