The teen suspects accused of hurling a large rock that killed a Colorado motorist took a photo of the deadly mayhem, then pledged a "blood brothers" oath to keep quiet about the crime, investigators alleged Thursday. Kwak said that the impact on Bartell’s car sounded like a “rail gun” and that he snapped a picture of the devastation because “he thought Joseph or Mitch would want it as a memento,” the affidavit said. Attorneys for all three defendants couldn't immediately be reached for comment Thursday