If he had been in the break he maybe could have won it, although Van Garderen and Riblon were both really strong, it's not a given that he could have beaten them.
Otherwise it was hopeless, there was no way anyone could make up that much time to the breakaway and to stay with the yellow jersey was not an option either.
In any case, it was fun to see him and he looked good! Bridged up to the Nieve, Voeckler, Rolland, Poels group in no time, and those are not "some sh*t riders who came out of nowhere", to quote his Lordship of Wiganshire.
I think he mostly did it for the fun of it, good on him!