Normal steps have two projections, one at the beginning, and the second one at the end of the step. Once the old base leg has fully extended, it will be free of weight, it will become the new free leg and it will extend toward its former position. This is the second projection.
The newly-freed old base leg should not promptly join the new base leg (“collect”, deprecated). It’s now free, which means  it now belongs to the mark so it must be available to him and not doing anything arbitrary and  it should be beautiful, with knee and ankle extended and toes pointed toward its former position. When the free leg is extending in this second projection, it creates spaciousness for the mark to create.