Here’s a new video tutorial for inline skaters wanting to learn more ‘care skills’. This one is on ‘Pumping’ or the creation of acceleration without a stroke during a two footed turn. This is a prerequisite skill for the Double Push which has this element incorporated but on one leg (after the usual stroke).
I hope this increases your understanding of skating and propulsion. This isn’t an easy move although it looks like it. The scraping sound is the proof that you are doing it right and getting the front of foot to back of foot weight shift correct. If your toe wheels lift off the floor completely then you are lifting your knees too far and too fast, make the movement more subtle until the front wheels lightly scrape over the surface.