Embed from Getty Images Maurizio Sarri conducted football management’s ultimate sin (just ask Mark Hughes) after watching his Chelsea side get well and truly disembowelled by a rampant Man City side at the Etihad on Sunday. After falling four goals behind inside the first 25 minutes, the Blues ultimately found themselves on the wrong end of a thoroughly embarrassing 6-0 pasting. When the final whistle eventually put him out of his visible misery, Sarri just turned and started walking –…