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"But I haven't forgotten that someone, probably Logan, is watching us... threatening us."

Shep believes that Logan is the one threatening Kate and him with pictures.

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"Carrying the Remington.
His face is framed perfectly in the image, his hands on the gun. It's John Michael Forres

John Michael had the gun in his hands on camera.

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"Was Henry furious enough to kill Grant if he thought he was the one who took it?"

Henry might have been mad enough to kill Grant for taking the pictures.

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"What the hell do you think you're doing? You think you're going to point a gun at me and..." - what Lindsay heard when she was calling Grant the moment she died.

This makes it obvious that it wasn't an accident.

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By saying "ramrod posture" Kate seems to imply them being "stuck up"

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"I wish I could see the boys' faces rather than just the ramrod posture of their backs."

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Louisiana is a "shall issue" state for concealed carry. The Louisiana Department of Public Safety and Corrections shall issue a concealed handgun permit to qualified applicants, after performing an NCIS background check and giving the local police 10 days to provide additional information about the applicant. An applicant must demonstrate handgun proficiency by taking a training course from an approved instructor, or by having been trained while serving in the  military.

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Kate thinks that John Michael might have killed Grant because the murder was on his families property.

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"I mean, the reporters love bringing up that Grant was killed on John Michael Forre's family land."

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Kate thinks that Henry would just buy his way out of trouble.

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"Then there's Henry Carsile - the bad boy. I've heard rumors about him since grade school. He's the richest in the group, and also the most likely to buy his way out of trouble.