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I have no idea what he is, what he thinks. I don't want to know the man I'm... trying to destroy.
— Captain Murrell · The Enemy Below

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker admits choosing not to know anything about the opponent, neither what he is nor what he thinks, because the task is destroying him. It suggests that understanding someone makes harming them harder, so distance protects the resolve.
Context reviewed