Thanks for posting and the gifs.

A couple things to think about on this stage finish. If you see the slow mo videos you will see that Cav was already falling before Sagan puts his elbow out. Cav was going on the inside trying to make a hole where there wasn't one. In fact Cav was the aggressor in that he was trying to shove Sagan over with his head as Cav has done to many other riders in the past. Sagan wasn't going to be pushed over and Cav's wheels must have started catching the curb and that's when we see Sagans elbow go out.

What Sagan was actually doing was try to stay upright himself.

Also if Sagan did do something wrong (he didn't) the normal penalty is to relegate the rider to last position on the stage. I think this is the first time they've booted a rider out of the whole race for something like this.

The penalty is too harsh and race officials should be judging consistently and fairly. This was neither.

I do hope Cav heals up quickly. Both riders are very fast and exciting to see race.