You can only sweep when your opponent's heel is down. You can't sweep him when his toes is down but his heel is still up. Heel down is "committed". Toes down is "not committed".Eric,
Wouldn't getting swept have more to do with where you've placed your weight? I can step with toe or heel keeping my weight on the back leg, though I can see where stepping toe first might encourage you to keep your weight on the rear until it's safe to advance.