Van witness does not believe Gray broke his own neck, fears for his life because of police lying...

It's hard to imagine how someone crushes their larynx and severs their spine banging their own head against a closed van door. The police officer who was driving the van made a stop he did not report and is now refusing to be interviewed. 

Via CBS Baltimore:

“I am Donta Allen. I am the one who was in the van with Freddie Gray,” Allen said.
The one who the police commissioner calls the second prisoner in the van.
“The second prisoner who was picked up said that he didn’t see any harm done to Freddie at all,” Commissioner Anthony Batts said. “What he has said is that he heard Freddie thrashing about.”
But Allen wants to set something straight.
“All I did was go straight to the station, but I heard a little banging like he was banging his head,” he said.
He tells WJZ he’s angry about an internal police report published in The Washington Post.
“And they trying to make it seem like I told them that, I made it like Freddie Gray did that to hisself (sic),” Allen said. “Why the [expletive] would he do that to hisself (sic)?”
Allen was in the van because he allegedly stole a cigarette from a store on North Avenue.
He was never charged. Instead he was brought straight to the station.

How can the police arrest someone, throw them in the back of a van and not charge them when they get to the station?