what snowprofessor, who's a level 3 and on ed staff, is getting at is utilizing upper body and lower body separation. he uses the wipering motion to simplify things and explain it in terms a non certified instructor would understand. He's essentially making pivot turns. in moguls it's key to have independent leg flexion/extension, being dynamic and having upper body and lower body separation. where kicking your back leg out isn't the preferred method in carving, it's usually needed in moguls.