It was not his best day

Book should have come out earlier and would have avoided a lot of the mess later.

Also, by even signaling for a penalty first before talking to the AR, he created the controversy. It was clearly not a penalty and since there's no VAR until the later rounds, he should have consulted first. And it doesn't require a conversation, it's freaking eye contact.

Oh, and re: Keita - Liverpool fans better hope he gets his impulses under control. You can complain about his first yellow, but he was absolutely baited into his second by Lewandowski. Got played.