toppin plants when they are in flower will cause the plant to hermie on u, when u prune and top a plant the plant thinks its being attackd, it will respond by tryin to make sure it reproduces, u might get lucky and only have one male flower and not pollinate to much of the crop, and usually by the time the plant throws out the male flower and has spread pollen the seeds dont have time to form into full seeds so u wont find alot, but it can and does happen, and if u decide to plan to prune severly while in flower expect more male flowers, the more stress u put on the plant when it flowers the more chance u have of gettin sum hermies, i usually try to wait atleast 7 days after i top or prune by plants before i start flowering them