The reed moves against the air flow. This is a striking counter-intuitive finding. This seems intuitive because during a blow the pressure in the chamber increases. The draw reed, although nearly idle during blowing, appeared to displace slightly upward, into its respective reed slot and into the comb. So the increased pressure provided by the blow does not push the draw reed farther away from the comb.
Aerodynamic effects draw it inward.
So, also, during a draw the blow reed moves against the airflow, and moves outward. However, this was observed to be the case only for the high blow notes. They open together and close together during draws. Parallel motion of reeds can be interpreted as both reeds acting simultaneously to close, or open, their respective reed slots. The diagrams show a little pause of the draw reed right as it crosses its slot.