I've always been amused by Kirk's voice-over near the end. "Beaten and sobbing, Finney told me where he had sabotaged the prime energy circuits."
It's not identified as a log entry but if it is I find it funny that beating the charges weren't enough for Kirk. He wanted a little extra humiliation on Finney's record for a final payback.
Perhaps Kirk means "beaten" in the sense that Finney was finally defeated in his scheme, beaten in his plotting, not physically beaten (although yeah, there were physical blows).