Warranty won´t take care of that? I mean, if the saddle doesnt even look like it has crashed (something I can´t tell from the pic) I would go and say "just snapped" Wich is half true, by the severity of the crash you expose "Went down on ice, not hard"). Zero remorse.
Curious, what kind of seat post are you using? If it is an offset type clamp, it could create enough force in a fall to cause a clean break. Just think of scissors. If it is a seatpost with symmetrical opposing sides, the seat carbon rails may have been able to handle the impact a bit better.
No CF isn't more brittle during cold weather... at least not down to temps seen while riding bicycles. CF is actually one of the more temperature neutral materials, otherwise they'd never be using the stuff to make spacecraft from (the wing leading edges of the shuttle for example are a carbon-carbon composite structure and they see extreme heat as well as extreme cold).
I have a friend, he bends saddle rails... regularly... regardless of material. Ti rails, CrMo, oversized steel on jump saddles.... bends them all. He's never snapped one though, but I suspect if he went with CF he might be able to actually kill one that way too.
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