I think it's more what the opposition manager has told his players at half-time. They make subtle changes which MA seems unwilling to counter in timely fashion.
On a separate note, I thought Tommy did ok last night.
he is reactive, Emery totally outdone him tactically on Sunday. He saw a big weakness and made the right sub.
I think it's a bit niave that he thinks well we done ok so lets carry on.
Villa the warning signs were there before the 1st half ended.