Even with Chelsea a goal to the good against Arsenal on Saturday, Antonio Conte was suddenly incensed late in the first half.
For the often-animated manager it was a familiar spike in his emotions. Conte grabbed at the jacket of his assistant Angelo Alessio and bellowed at him to get down the touchline to sort out the issue he had identified.
'I was angry because (N'Golo) Kante was supposed to track back in place of (Victor) Moses,' he said afterwards. 'When I see something that isn't going right, I am capable of murdering anyone.'
Conte is hugely invested in the fortunes of Moses – and Marcos Alonso – as the two wing backs in his 3-5-2 system which has taken the Premier League by storm.