Hey bud, I think that the rut up here was a little earlier than most think. You ran into a buck that probably came across the path of a hot doe. The second estrous should of started about the time of the zone t hunt. After the first estrous period, if a doe does not breed she may come back into heat 28 day's later. If it is a young doe and she didn't come into estrous during the first cycle, she may come into estrous during the second estrous. The zone t hunt here in WI really screwd up the good late season hunting here in WI.