Since the shooting of 18-year-old Michael Brown in St. Louis, MO on August 9th, the accounts of police and eyewitnesses have differed greatly: witnesses say he was shot as he ran away from an officer who was trying to stop or arrest him, but the police insist that he assaulted an officer and reached for his gun. Today, Rolling Stone correspondent Tim Dickinson found what looks like an account from another witness — posted to Twitter as immediately after the shooting happened.