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I agree with Boutte that a video was available back when this kicked off. I remember seeing the guy getting kicked in the head and I agreed with SuperChuck that the prosecution would have to prove that is was Kamara's blows that did the damage.
I’d like to know just how true that is. If my family member is jumped by a gang of five people, and it resulted in my loved one having chronic TBI or death, is there any hope for justice.
I don't remember that specific exchange so I can't say that I endorse it now. I would expect that if the element of a charge is that the specific defendant caused the victim to sustain a specific injury, the prosecution would have to prove that.
But that doesn't necessarily mean that the prosecution has to connect with 100% accuracy a punch thrown by Kamara causing a serious injury (e.g. orbital fracture) to Greene. The prosecution could, for example, show video of specific punches thrown by Kamara and then offer expert medical testimony that the force and location of the punch(es) appear to be of the nature that would cause the injury. And then the jury decides if they agree.
So in the hypo about a family member being jumped by a gang of five people, there are different ways that the prosecution could make the case to a jury about the conduct of the defendants as charged. Often how they do that is find one of the group that most likely didn't commit the crime and attempt to use leverage against them to offer testimony about what they saw actually happen. But there are other ways, and there are also some charges that don't require that same degree of specific culpability.