This walk is a bit unusual and tends to go in and out of Cross System. It’s referred to colloqually as an “Inside Snake Walk” because it resembles a snaking or undulating pattern with the feet as they step. See also The 6 Ways of Walking.
It should be noted that the in the case of the Type 4 and 5 walk, the Follower’s walking pattern DOES NOT CHANGE. The Follower is continuing to step backward on two separate but equal walking paths (with their feet) that do NOT cross over the body’s natural meridian (as it would in Lazy or Milonguero Ochos).