In one of the De Zerbi post-match interviews, the interviewer asked him if he understood the rule that led to him being sent off, which was something like "failure to control your coaching staff".
Agreed.
I've said it elsewhere, but I can forgive Attwell, or any ref for that matter, even though he was perfectly-placed. A one-off take on something at live-speed being played out by world-class athletes who are trying to con you at all the time. Of course, referees will get it wrong on...