This pattern is made up of some things that I picked up off this website and some that I stole from other instructors around town.
Step is horizontal.
It's just a basic step but with 2 alternating back lunges from the step before you return to the floor. Start the mambo, then straddle down before completing the mambo, still facing the way you started. Three marches on the floor with a heel tap to the front on beat four, then three marches back, with a toe tap to the back on beat four.