I have to agree completly with Ledyard sensei on this one. The only attacks I've experienced that included kicking was aimed at my knees or groin. If you think about it, knees are the closest targets to kick. Sword people know this all to well. You must either enter and jam the kick or enter around the kick and involk a defensive response from the attacker. Backing up will just serve to make you a bigger target, unless of course you're making distance in an attempt to introduce the attacker to Mr. Smith and Wesson.