I guess CSC figured that Evans would stick to yellow, so sent Sastre up the road to try and put some time into him. It really was win-win for CSC, clever riding. Evans has something else to consider.
He (Evans) has just been interviewed and was all smiles (he looked f*cked when he crossed the line though!). Says he did what he could, he knows he has the advantage over Sastre in the TT, so knows he's still in it. No headbutts or threats, just a tired looking rider with an honest appraisal of the day's events.