Anonymous. That's right . The standing leg will straighten. That's where the two straight legs come from, with the back heel off the floor the front toe off the floor and the weight dead center ( split weight )at this time We will come back to this position in a minute. The weight will move back with the moving leg, not the extending leg, untill it draws level with the standing leg, then the heel will lower to the floor. As the heel lowers we will be in a nuetral position. Then that knee bends towards the front as the moving leg starts its journey backwards. Even though the leg is moving backwards as the supporting knee moves forward we should have a feeling of going towards our partner momentarily and not away from our partner untill the toe is reaching its full extension behind us.
To get back to the above. If you watch a top class athletics meeting. You will see a perfect example of the body which is still, moved by the legs. Not the other way around. If you are one of those that has a camera that records onto a DVD. Play it slowly as normal. Then play it in reverse in slow motion. Then go to a DVD of a world class Foxtrot. Do you see the resemblance to dancing as the heel touches the floor. Yes we know the footwork is different and runners don't run backwards, and don't have CBM and all the rest of it.
With dancing there is a moment when if they stopped dead. You wouldn't know whether they are going forward or backward. In fact that question was posed in a magazine I have somewhere. The question was. Are they going forward or backward. There was no way of knowing. My guess was forward, but it could also have been a Wave. The moral of this whole story is. If the lowering is too early you will be pulling away from your partner and it will be very obviouse in which direction you are going . I'm really suprised that this very basic is even being discussed. There are enough books and tapes and DVD's out there on this very subject even at the lowest level.