"It hit her and it just went 'Boom!' It blew her down," Willis said.

He said he and two others "ran over there as fast as we could ... she was screaming, 'My arm is gone!'

He said the police were firing tear gas canisters while she was down. "When we'd gone through action training, they were saying when someone gets hurt, it's usually best to just leave them, but we knew it was her arm and we had to get her out of there," he said. "We just picked her up. We ran until we found a car" and put her in it.

"That's when I first really saw her arm. You could see bone and blood."

Other Bull was also nearby, and his account matches Willis'.

"They shot her with a rubber bullet and she fell. She was trying to get up and run back and that's when they threw that grenade at her. Big old wound. All open. As big as a hand."

Willis said he saw men get out of a giant armored vehicle labeled Stutsman County (N.D.). "They were laughing. One of them said something like 'That was a beautiful shot.'

"We couldn't believe it was the police saying it. They didn't act like professionals at all. They acted like were in a different country and they were in a war.