I went to check on my chickens this morning ,and I saw a pile of blood and feathers outside of the coop. So, I ran inside and didn't see anything wrong with any of the chickens. So later on I went and let them outside and I noticed one of them limping. I soon realize that he has no foot. His foot has gotten caught in the window and ripped off(that's why the blood and feathers were outside the coop), and it is blood. I don't know how long it has been like that or anything. I am new to owning chickens and do not know what to do. I sent my friend to Tractor Supply to get iodine animal wound cleaning spray, Neosporin ( non-medicated), and animal bandage, but I don't know what to do at all. Someone please help me.