O’Brien’s daughter Kathleen asks O’Brien if he has ever killed anyone. So he imaged she was an adult and told her the whole story
When the man came out of the fog, O'Brien was nervous but before he could think he tossed the grenade. The man dropped his weapon and started to run.
It was to late he realized he was ready to die , the man fell on his back and his sandals flew off. He feel like he is the reason he died but if the the man passed Kiowa he would've still died, he thinks bout it still.