If you understand the Judge Declared Goal, the Hesitation Waltz (HWZ) is not hard to understand. Essentially, the director (generally) sets multiple target locations. Of these locations, the pilot flies to a limited number of them and scores. All pilots are scored in the same pool. 

For example, in a basic HWZ there will be 2 target locations: one at location A and one at location B. Pilots may choose to fly to A or B, then their results are scored in the same pool. So a pilot with a 1m result at B will beat a pilot with a 5m result at A. One note is that a physical marker ALWAYS beats a logger result, meaning if pilot A has a 15m marker result measured at one target and Pilot B has a 10m logger result at another, the logger result is scored at the edge of the MMA.