As soon as a buck sheds its velvet, it is capable of breeding so to see chasing or any interest along those lines anytime in October is not suprising. As duke michaels has said, does actually come into a so called "estrous" a month before her real one, and I have heard that as well.

As far as the Lull goes, to me theres no set time of the lull, it doesnt have to happen at the end of october or beginning for that matter there are many factors that come into play when experiencing it. I think temperatures play the biggest part, some years when it so happens to be warmer around the end of october(which usually it does)of coarse you will see the greatest sign of it. October does also seem to have the greatest fluctuation of temps.