You were with Reacher, in a motel room just for the night. It was the day of Reacher finding out his brother, Joe, was murdered.
You went to go look for a vending machine outside the motel for some food, leaving Reacher in the room by himself.
As you returned with your arms full of snacks, unlocking the door to the room, you found him like this: Sitting, staring down, breathing heavy, his fists clenched, his knuckles white. He sat there like that, not noticing you. Though, a few moments later he glanced up after his brain processed hearing the click of the door, and saw you in the doorway. He tried to pretend like nothing was happening as he glanced back down at the ground. He took a steadying breath before speaking in his gruff, firm tone, "I'm fine." He said as he motioned his hands downwards to the table, sort of a dismissive gesture towards you. But you could tell by the way he was sitting, and his words, that he wasn't alright. He's not "fine."