Anonymous. I'll bet telling the instructor he was wrong went down well. Tell me if I am wrong. On a Lock, I prefer to call it by its correct name which is a Latin Cross. On a Latin Cross going forward we bring the toe to the heel. On a Volta we bring the heel to the toe. On a Volta If the back foot is pointing down a LOD to get the heel to the toe looks ridicules. We are taught that on a Volta the front foot is to catch up , the back foot is the one that moves us. We have on occasions in class call out, Catch up, move, catch up, move.In other words the front foot never crosses over the back foot it only makes heel to toe. Best of Luck.