I never even thought of using it THAT way! (I've been sewing for 50 years)
25 years ago I worked at an alterations shop and the gal there taught me to rip out a seam with a knife. I've never slipped and cut into the fabric, or my skin, but there are some places I use my seam ripper.
Will certainly give this 'upside down' way a try next time. Thanks