interesting, i had my class do that kind of drill, pulling away frm the wall, but i don't think i never did it again because i didn't see any lightbulb moments for anyone.

the arm-bending for me feels more about pushing my shoulders forward -- that's the primary goal, and my arms may or may not bend to make it happen. it's really hard to recover a straight hs after i do this though. it's much better if i can stay focused and save the underbalance before it gets bad. as you say, it's about detection. which is why at a certain point hss are much more a mind game than a body game.