Lincoln and John discuss how Father James is taking the bloody path of mayhem and revenge Lincoln has embarked upon. Lincoln explains that he's not happy about it and that the Father thinks that Donovan is most likely the devil.
Donovan has looked into the Fathers military service record, explaining that even though he was a medic he saw action at Climback with the 614th, taking out two Kraut tanks along with the 16 men he shot. A lot of killing for a would-be priest.
Lincoln says that was different, it was war, and Donovan replies that this is no different. We didn't win that war by worrying about hurting someones feelings, it was won by kicking the Krauts and Nips back to the stone-age and the padre'd be wise to remember that.