"My teacher a world finalist called that "if I remember correctly" splitting the beat,also by splitting the beat one leg is always moving when we dance, so that as soon as the right leg is along side the left the left is moving befor you have lowered."
This is not really right. There are period of time with the feet apart where the body is moving horizontally but the feet are not. Some might mistakenly consider these to be times of split weight; they aren't, but they are times when the body is in transition and the trailing foot should not yet have started to draw closed.
On three of a foot closure waltz figure, the standing heel should touch the floor before the moving thigh swings backwards. The foot can articulate backwards from the ankle and to a limited extent the knee before this, but during the time when there is substantial foot rise the legs will not have yet begun to divide. Many dances fall off the foot closure steps into a feet-apart landing, rather than accomplishing much of the lowering before the legs divide.