Wow. That's about 1 in 100 occurrence. How many times have we seen the breakaway blow it in the last 200 meters. Sagan's going to be annoyed to say the least.
It did remind me of the Degenkolb sprint from a few years ago. There was a crash I believe with something like 700m to go, and he had no choice but to throttle up the whole time.
I thought I saw Valverde in fourth wheel around 1km out but then he didn't try to contest for bonus time ? Maybe he figured it's not worth the risk, and maybe he was right, that was unusual