I dont get how he couldve saved his life?

Question

He was in a prison in world war two and a soldier in priosn. The sentence before it was about how people were being shot.

One morning some guards came to get us and when they opened the door Bill hit me hard on the back of neck. He probably saved my life.

Answer 1

Life is full of surprises.

Answer 2

Well take a look at this please.

http://www.youtube.com/watch?v=Q-jzNfxKS...