I believe Sagan said after the race that he just couldn't at that moment. He spent a lot of energy in the chase after Vansummeren broke the group with his fallEl Pistolero said:He's a Gilbert type of rider, only faster in the sprint. Makes me wonder why Sagan didn't react to Pozzato's attack on the Oude Kwaremont. He was right there at the front and strong enough to ride away from everyone else on the Paterberg and go solo.
At Paterberg he felt better but then it was too late...