* I can't imagine a chain falling off for no reason, especially not with a meticuously maintained top group;
* If AS did bad shifting that would cause a chain to drop, would it drop immediately? Isn't it possible that the chain would drop a few seconds later, when there's a change in power?
* I saw on the site
herethat a lot of riders have a guard installed to prevent the chain in front from getting off to the left... AC has none. It's a risk to take.
* Some articles say that Riis himself got the chain back on,
but to me it seems like AS put it on by himself.