Kevin knew he was crazy. He had been since that night, over a year ago, when Amanda had bid him and Art a cheerful "See you later!" and gone off to fix their problem by herself, when the sound of the explosion had reached him over a kilometer away.
He and Art had lived in the forest since then, and with nothing but the silent Art and his own thoughts for company, Kevin had quickly started to hallucinate. Art did his best to keep both of them alive, but Kevin had barely eaten since the explosion and constantly woke up screaming during the night. Kevin spent most of his time following Art around, but too often he'd scream, or start crying, and try to run from something only he could see.
Kevin had good days and bad days. On good days, Art got him to go outside, or maybe eat a decent meal for once. On bad days, it was all Art could do to keep Kevin from killing himself.
Today was a good day, however, and Art took Kevin outside. They walked through the trees, Art pointing out things like birds that Kevin wouldn't notice otherwise. It was going well. Then Kevin had come out of the trees into a swamp, and on the ground in front of Kevin's feet was a red mushroom.
Kevin stepped back as if he'd been hit and started to sob: Amanda had loved mushrooms. As Art guided him back towards their house, Kevin saw a flash of red hair. Amanda! He ran towards her, but he suddenly stopped. She shouted at him "You killed me! You left me to die like I didn't matter!"
Art saw Kevin cover his ears. He was hallucinating again. Art managed to get Kevin back to their house, with some difficulty, then he sat and watched Kevin. If, when, Kevin recovered Art knew he'd be grateful. In the meantime, Art had to keep them both alive. Kevin cried for a while longer, then fell into a nightmare-wracked sleep.