You have to wonder about someone who would approach two guys he suspects of multiple murders alone and accuse them. Nathan wasn't the only one making a mistake and Tarn was a repeat offender. His first was getting so close to the cell to be assaulted. Tarn was just too dumb to live. I did expect a little cleaner kill from Nathan, but more drama, I get it.
Cormac is the beggar, an ex-monk. His curse is to see the auras of people, all their sins laid bare in color. I can see how constantly viewing hypocrisy every day would challenge your faith.
Nathan and Brohm are going to try and break this cycle of pushing each other away. Nathan is trying to overcompensate for his past sins and Brohm still lets anger rule him too easily.