Probably couldn't. Intensity of the whole race was pretty high; he was only able to properly make his attacks stick once Froome and the rest of Sky were significantly fatigued/ill - as in the final two mountain stages. He did attack Froome on the first Pyrenean stage, but if you remember Sky reeled that in pretty smartly and Froome launched a counter move that Quintana couldn't follow.
Probably couldn't. Intensity of the whole race was pretty high; he was only able to properly make his attacks stick once Froome and the rest of Sky were significantly fatigued/ill - as in the final two mountain stages. He did attack Froome on the first Pyrenean stage, but if you remember Sky reeled that in pretty smartly and Froome launched a counter move that Quintana couldn't follow.