In answer to Robert Cowham's question in another thread, I've never seen anything written about Feldenkrais and flinch, but there is an oral tradition as follows:
1. In pre-Independence Palestine, the Jewish and Arab youth got in street fights. The Jewish youth lost - invariably
2. One of the youth found a book on jiujitsu. They studied the book, practiced the moves, and in the next fight . . . . they lost.
3. Feldenkrais, so the story goes, would hide in alleyways, and other secluded spots and when an innocent passerby walked past, he'd leap out, brandishing a knife and attacking at one or another angle (slash or stab). He'd 'photograph,' mentally, the defensive reaction the the person initiated to avoid being stabbed in the throat or slashed across the face, then he'd run away (NOTE: he never cut or slashed someone, just initiated the threat).
4. He then based a set of attacks and defenses, based on the 'natural' reactions of untrained fighters to attack. Because they were 'natural' responses, they were easily learned - and in subsequent street battles, the Yeshiva boys won.
I've seen a jiujitsu book that Feldenkrais published before he met Jigoro Kano or trained in judo. Self-made. (he was a bull of a man). There were a few moves that were 'street,' but most were rather text-book jiujitsu moves. Nothing special. Don't know if this is what he came up with, or if the legend is just a legend or if his 'real' techniques were not published in this book.
Here's the book in question
Jiu-Jitsu and Self Defense