Thanks.
I would've brought my sturdy bow of Romanian origin on my exchange year, but there was only room for one in the case so I left that at home... my bad.
I should get a CF. I should've gotten one long ago. I could survive the loss of the bow, and my stupidity of not buying a CF earlier, if it wasn't that I might have screwed things up insurance-wise, too...
It was a piece by a jazz composer, Erlend Skomsvoll by name. The bass section is supposed to keep a steady, bluesy groove throughout the piece and has to be heard through a big wind section. I thought I would spare the bow by hitting the string with the hair hard enough that the strings slap against the fingerboard and make a 'legno' sound... turned out there are no good way to play a loud col legno with a wooden bow.
Then, there was a thin, dark ring in the wood where the bow snapped. I think there was some weakness.