I wonder what kind of case it was; it says he fell down a flight of stair onto it. Seems like even a lot of hard cases could crush under that kind of pressure.
I once watched a bow of mine ride down two flights of concrete stairs literally seconds before going onstage for a symphony gig. Heart attack!

Tucking a bow under your strings may SEEM safe, but dude, it isn't! Use a bow case at all times! I've no clue how that bow survived, bit it did so without a scratch.