"Before I turned around and looked at her, the car had jerked out of control. I don't know if she did it on purpose or how fast she was going," he said.
Henry and Lewis were treated for bruising and other injuries and are expected to be key to the investigation.
"They have been extremely cooperative," Holt said. "I'm certain they are grieving, but they are cooperating. Medically speaking, they are going to be just fine."
The other victims were identified as Andrique Bennett, 14, Brandon Murray, 17, and Kirklan Behner, Daylan Ray and Ramone White, all 15 years old.
Warren City Schools Superintendent Michael Notar said grief counselors would be available at schools throughout the district today, where the victims attended classes.
"It was very desperately needed for those who needed to come in and let their feelings out," he said.
Henry said the trauma of the accident is going to stay with him for the rest of his life.
"All of them were my boys that I was with," he said. "They were younger, but they all looked up to me. We all looked out for everybody."
ABC News' Michael S. James contributed to this report.