The Quick Ripper simply cuts the threads as it moves along! Place the Quick Ripper between the seams and use just the corner of the blades to snap a few threads. The blades lay flat along the fabric, shearing through the threads.
Once the first few threads are clipped, then you simply fold back the top fabric and gently glide the ripper along the bottom fabric. The blades of the ripper don't actually touch the top layer of the fabric.