When Achmed was also captured, Padros managed to unite the captives and organize an escape attempt during the next Kalos Kalyre. He build an underground passage under the mill which was connected to the shaft where the Gaealith was kept. He was instructed to say the code word "looks like nasty weather" and expect the reply "Yes, it looks like it's going to be a long winter" to recognise other captives who were part of the plan.
Amun is credited as "Windmill Keeper". His name never appears on-screen. It's equally possible that his name is Amon.