Hmmm. If you took the time to bring blinding powder -- you probably have a weapon as well.
How hard is it to bludgeon someone when they are blind or (mostly blind)...
As to your other question about the thumb shot -- fall down. I only know of a couple of people in the BJK who subscribe to such idiocy. Most of the time it is "this is a good shot - and may end the fight. If it doesn't -- then... blah blah blah."
Most of us have some sense of reality (despite what others may say...).
-Daniel
