My (regular) fat bike frame broke at the same place. Are you tall and was this a large size frame? Mine broke when I stood up on the pedals: the whole body weight + the pressure applied and transmitted through the chain, pulling the wheel axis frotnwards. I have the feeling long frames are more likely to break this way, and fat bike frames too as the chain stay has to make a big curve to leave room for the tire, which weakens the tube and its ability to respond to tensions which are not any more directed in the ‘right’ way.

The parachute was covering the top of the balloon. It remained in position once the balloon deflated, and allowed to fall gently. There were several demonstrations, I think; people were crazy about ballons back then and experimented a lot of things.

Here is one one of the accounts in French, published in Le Républicain’s edition from Aug 12, 1894 :