TL;CR MEME

TL;CR MEME
1. Comment with your character.
2. Receive comments from others.
3. Reply to their comments with long ballads and explanations of your characters' relationship throughout the game.
4. Endure everyone else reading your comment like the vultures they are.
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Based on his logic, she was one of the likely candidates (it helped that he felt like she wasn't popular enough to cause a lot of backlash if he accused her) so he was making preparations to confront her that trial. (THE LIE DETECTION WAS ORIGINALLY MEANT FOR HER.) Actually, he was originally going to kill her but Merriment talked him down and Ray figured it was because she would've kicked his ass.
(Admittedly, if he had killed her, he wouldn't have felt bad about being wrong because it's not like he particularly liked Luna either or thought she was a good person.)
So overall, it was nothing personal, and it's why he didn't exactly dislike Luna when he ended up in the GY. He remained wary of her, and her attitude went against what he wanted to accomplish so she was still sort of an "enemy" in that way, but she didn't kill anyone Ray personally cared about so she was sort-of-okay.