I didn't know that was a certain way either, although after watching the video - I realized 90 percent of the time I do use it that way -just because you don't rip your fabric and it makes you feel good when you do long sections all at once on the second step.
I have a story to tell - At a recent retreat I had to use my ripper several times and after awhile I would just announce that I had another date with "Jack", at first it took people a while to ask me what I meant, who was Jack? "Jack the Ripper" - so by the end of the retreat the ladies in my corner of the room had named all their rippers different names -- some based on their male or female colors and you would hear announcements everytime they had a date with Antonio (he was classy), George(plain and reliable) or Jacques (cause he was lavender) etc. It added fun to our retreat.