The former Juventus and Fiorentina player Angelo Di Livio talked to Gazza Offside about Walter Mazzarri:
“I’m wondering where the old Walter Mazzarri has gone, the coach that would be furious, throw his jacket away and such things. Today I just see a very worried coach, at Napoli his body language made the difference and his strength was to motivate his team in front of his bench. Now the situations is very different.”
Source: Fcinternews.it

he just need to cool his head
I agree with this, the only thing you can see about Mazzarri on the bench since he came to Inter is panic.
It’s the thing I dislike most about him, if I were a player on his team and he had that expression of fear every time I looked to my bench, I’d probably want to punch him eventually.
couldnt have said better