When we first learn to turn we do what we call up-unweighting or most extended at edge change. This means we ride across the hill in a flexed stance and extend (or get taller) to unweight the engaged edge enabling us to transfer to our new edge then get lower throughout the turn, to then rise again for the next edge change...
Later we start to play around with down-unweighting or most flexed at edge change. This means we are riding across the hill extended or tall, and we flex (aka bend our knees & ankles aka retract our legs) to unweight the edge enabling us to transfer to our new edge, we then extend through the turn, to flex again. What Snowolf was suggesting is a strong retraction at edge change. Meaning ride tall across the hill and suck your legs up to you to enable the edge change.
Watch some videos on down-unweighting or dynamic turns. This will explain this topic more, as there is a lot more to the timing of it. Such as changing your edge with the board traveling across the fall line, extend your legs laterally or across the hill, so that immediately after the apex (your board is just starting to turn across the hill) your most extended and you can begin flexing for your next turn.
Just some personal info, I ride a proto ctx 158, and I ride in centered in deep cascade concrete.