Mage
I'll make you submit!
Trace, just practice it from a crouching position. Then use your Index finger to slide from A to B, it should work. (P.S. I can sometimes pull it off using my thumb)To ask for the umbrella technique beter ask Doc! he has incredible succesfull rate of the JF umbrella, I can only tell you when you have to buffered it, because I only can do it in JF buffered :(