Hit it with steam, and see if it falls into place? It won't take much. It might take a cleaned finger stroke or two to help it go back into place. If the feather is actually bent to the point that the shaft is kinked, you will struggle to get it back into place. Simply boil some water in a tea pot, and run a few passes of steam with the bird held upside down, so it steams it directly. No need for high pressure steam, a simple waft of steam will do if the feather is not kinked. I used to shoot feather fletchings on my arrow shafts, and if they ever got distorted, I would hit them with steam, and it is amazing how well they fall back into place.