I think it is a scape. I have bunches of them this year. Don't know why there are so many. When I've had them in the past, I just leave the scape alone until fall or the scape shows signs of dying - whichever comes first. In my experience, Scapes with pods and those with prolifs tend to stay green and growing for a long time. Those without pods or prolifs turn brown pretty soon after bloom is gone. Sometimes those with prolifs have remained green right up to near frost. I haven't had any really make much in the way of roots. I tend to cut the scape off above the prolif pretty close to the growth, but leave a good bit below it for an anchor. The method I like was using a plastic water bottle filled with dirty creek sand. I poked the scape into the sand until where the roots would grow from a fan were just barely covered. I kept the sand damp. The clear bottle let me see how water I was delivering and it also let me see when long roots formed. I kept mine in a sunny south window for the winter months.
Taken out of the plastic bottle for planting:
