And about that separation of powers, I am assuming that none of the Pevensies had a sufficient grounding in law and concepts of separation of power to meaningfully implement an English style common law system - to say nothing of a civil system. I think the best that can be done is that aim to, and try to be fair, afford some sort of process and to find truth in a combined investigative, prosecutorial function. Edmund knows he is accountable to Aslan and to his sibs. This is also where I feel his experience as reformed traitor is profound. I will assume that they have enough understanding to have gotten the concept of "presumption of innocence" and they all powerfully believe in the capability of redemption. So, I see Edmund as very slow to judgment, as affording process, as using the tools of the Beasts as sort of lie detectors in aggressive interrogation that is, yes, marginally coercive to secure confessions. That comfort with coerciveness isn't a nice place, but in the post-WW2 war crimes investigations, it was very real and routinely done. "Tell me the truth, or we hand you over to that mob." Our notions that coerced testimony might not be reliable post date WW2 and are part of more modern, recent jurisprudence. The unwritten story of Black, White and Gray in between was to explore all this -- the traitorous Moles and Mr. Noll and how they investigate and try the matter. And, well, there is the fact, in this chapter, that Edmund views his duty very seriously, he is a pretty emotionally detached person, and he views even the perpetrator(s) as under his authority and protection. He doesn't tell Linch that, but that's what he's thinking. That sense of duty trumps even Edmund's commitment (at this point, whatever it is) to Morgan.