https://www.rte.ie/sport/cycling/2017/0709/888907-uran-takes-victory-as-martin-loses-vital-time-in-crash/Porte, seen as one of the main contenders for the yellow jersey, misjudged a turn on the descent of the Mont du Chat - the last of seven categorised climbs on a brutal stage - taking out Martin and throwing both riders in the rock face at the side of the road.
"Richie lost it on one corner - it was so slippery,
I guess the organisers got what they wanted," he said. "It was so slippery under the trees.
"I was very, very lucky to get away as lightly as I did."
[My bold.
There is also this amusing bit of reporting:]
It all came down to a rare sprint finish between general classification contenders, with Uran coming out on top despite being stuck in a single gear after collecting debris as he dodged the Porte crash.
[Amusing as the "debris" he collected was in fact Dan Martin's foot catching Uran's derailleur!]