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Yanga-Mbiwa saw yellow in the 74th minute. He should have been off.
From the moment that referee Mike Jones wiped Cheik Tiote's strike off the board, Newcastle United played with purpose, resolve...and venom.
And Jones gave the Magpies free rein.
Yohan Cabaye received a yellow card in the 38th minute. He then played the remainder of the match as recklessly and violently as he had before the discipline. Several times in the second half, Cabaye delivered scything leg sweeps and full body checks that should have brought another yellow and a dismissal.
Compared to Mapou Yanga-Mbiwa's vicious tackle on Samir Nasri, though, Cabaye played like a demure schoolgirl.
Yanga-Mbiwa grabbed Nasri as he was pulling away from Yanga-Mbiwa. When the City Frenchman continued forward undeterred by the two-hand grab, Yanga-Mbiwa ruthlessly slashed Nasri's left leg. Soon thereafter, Nasri was writhing in pain and clutching his left knee.
Nasri was stretchered off the pitch. As of this writing the extent of his injury is unknown, but it did not look good.
City manager Manuel Pellegrini is legitimately concerned about Nasri's status, per Jack Gaughan of the Daily Mail: "Nasri has a serious injury with his knee – it was directly a red card. Maybe it’s medial ligaments. We’ll see tomorrow (Monday) what happens with him."
City also saw Yaya Toure limp off the pitch in the 61st minute after being on the receiving end of borderline physical play from the Magpies.
On balance, City probably would have preferred to just concede the Tiote goal and get a fair whistle thereafter. It was a horror day for Jones, and as a result it was a pretty bad one for Nasri, too.