That red was such a pain. It was ruled correctly in my opinion as far as it literally was a denial of a goal scoring opportunity, but clearly it wasn't intentional. Chanot saw he was going to be beaten for pace with the guy on an inside track to goal so he was giving up on the ball to try and take a better position for when the striker has to eventually turned for goal, and in doing to lightly clips his ankle ruining the next 90 minutes of play.
Urgh. I mean I don't want intent to be added to the rule or you are going to see lots of defenders hunting for "accidental" collisions on the chance the ref manages the game leniently for the sake of the product. No one outside of CLB wants a red there. I'd even venture to say some in CLB wouldn't want a red there for the sake of the match's entertainment value.
So whats chanot to do? Give him a two step lead before cutting over? If that guy goes on to score pundits will rip chanot for poor defending.
Best thing he could have done there is run side by side till he gets to the box then just manhandle him as much as he thinks he could get away with. If he score he score, but if you defend him you are a hero, and if you give the PK at least you have a full squad for a full 90 to respond. Way way way to early in the game to have a red come out. I mean unless you think getting a 0-0 draw was the more likely outcome then trying to come back 1-0 on the road. For me I would take the latter. This is probably a teachable moment for the squad. Early PK not the end of the world, early red less so. IMO.