You are going backwards, with constant crossovers done in front. See here: Hockey Powerskating / Edgework Circuit (by m2hockey). I tried to recreate that move (and I failed), I barely moved backwards.
My current theory -- let's say I glide on left, and I am doing crossover with right. So left is on external edge, I do crossover, right is on internal edge. After crossover I go from internal edge to external, and then I do crossover with left.
However in this video it looks much simpler. What do I miss?