either. we don't think gray was bouncing his head against the wall. we think the police officers said let's take him for a rough ride and the driver ernlly hit the brakes. >> right. but he he is the defense's best evidence that freddie gray did this to himself. that he was on drugs. which the autopsy report shows. that he was acting erratically. he got up in the back of the van to hurt himself. that's their theory. >> unless you have an expert like you had and said somebody could not cause this injury by themselves. >> correct. >> hold on. >> go ahead, mark. >> okay. all they have to do is create reasonable doubt. they don't have to say this witness is credible and thus this happened. they just have to come up with that as being a reasonable hypothesis of innocence. let me finish. baden said another possibility is that gray was injured prior to getting into the van and