One type of a single stroke is not unusual, circling left & right therefore is proper.
Left changes to Right & Right changes to Left, withdraw the body, reverse the steps, & you get the opportunity.
The steps quickly turn & the hands immediately follow, the rear palm Penetrates out & the lead palm returns.
Coming & going, going & coming, are not two causes, it must be like a crossbow arrow quickly leaving the string.
When Penetrating, straighten the palm, attach to the elbow, & go, the rear shoulder changes to become the front shoulder when finished.
You do not want distance, do not hesitate, the foot entering the crotch is the criteria.