According to Madiest journalist Nando Sanvito, Mazzarri’s expulsion occurred because Orsato interpreted Mazzarri’s passionate and emotional tone as an insult.  He said: “Actually, Mazzarri spoke with emotion and venom earlier in the match, which Orsato interpreted as the tactician criticizing him.  This happened again and there was a misunderstanding between the coach and the ref.  Piero Ausilio will speak to the press instead of Mazzarri.”

Source: FcInternews.it