Reason why Emery was shouting at Lucas Torreira after Chelsea defeat is revealed

Lucas Torreira was accosted on the pitch by Unai Emery after Arsenal's 3-2 defeat against Chelsea. Torreira was expected to start Arsenal's second Premier League match of the season against Chelsea, but he only started in the second half. In the Premier League the game is faster, and there were the odd moments when the midfielder was caught in possession on Saturday. And one such moment led to a goal.  

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