Russ, your selection of the tape involves a serious omission of proper context. In response to dispatch saying, "We don't need you to do that," Zimmerman says, "OK." It is interesting to note that the sound quality that could be identified as rushing air noticeably changes at the same time Zimmerman says, "OK." This could be taken as an indication that Zimmerman immediately stopped his pursuit.
In many people's minds, having a suspicious prowler around creates an emergency. But for the sake of argument I'll grant you a small concession; maybe emergency is a more severe variety of a common concept. At the very least, a prowler represents a threat. The proper response to a threat is to identify it and, when possible, take action that will eliminate it. Previous action of the type you prescribe was taken by Zimmerman countless times, to no meaningful effect. That you would have had Zimmerman sit on his hands and call the cops so they could drive over while a likely thief gets away is disappointing. But maybe I don't understand how it is you think Zimmerman acted immorally. In part, it sounds like you condemn him for risking his own safety without proper preparation. If that's the case, I'll counter that his firearm prepared him. I think this whole controversy is proof of that.
More serious is your condemnation of him for manslaughter.
I'll put aside the fact that you omit the time between Zimmerman's pursuit and the altercation and, by extension, mischaracterize the entire encounter. A pursuit is not a crime. I'll repeat myself, because manslaughter is a crime that is precipitated by or committed in concert with other criminal activity. A pursuit is not a crime, and so it is not evidence of manslaughter. You would have police prosecute Zimmerman on the assumption that he was criminally liable for a conflict in which he had all of the defensive wounds (save one), none of the offensive wounds, and fired only a single shot. Sure, it's possible that Zimmerman engaged in criminal activity and began the altercation. But the burden of proof for such an accusation is too high a bar to meet in this case. Prosecuting him is, at the very least, an absurd waste of time and money. But you go a step further with your statement that I quoted in bold. You don't just want to give the prosecution a chance to convince a jury that Zimmerman is guilty; you want Zimmerman to prove that he is innocent. You are saying, in effect, that Zimmerman is to be held culpable for our lack of knowledge. That's reckless and unjust.
That is a good point; it does sound like either he slowed down or stopped his pursuit. I only brought up the dispatch primarily to show, as fact, that Zimmerman was pursuing Martin. Indeed, it is not proven that Zimmerman continued with his pursuit after the dispatch warned him; it is a stretch for me to say that he neglected the warning, no matter my opinion on the probability of what Zimmerman might have done. However, I will not take Zimmerman's, "Okay" statement as an indication that he stopped his pursuit, but since that cannot be proven or disproven, that doesn't matter much.
On whether or not this was an emergency situation, maybe I misunderstood you. I took your statement as if you were invoking the ethics of emergencies, which I maintain does not apply to this case. If you were not talking about that, then we simply misunderstood each other. But, yes, I do agree that a prowler does present a threat, and there is nothing wrong with identifying a threat and acting to eliminate it. However, I don't see how you can suggest that Martin can be identified as a prowler. As far as I know, Martin was doing nothing wrong, had every right to be in that neighborhood--as well as anyone else, but his father actually lived near there--and he was on his way back to his father's place; it's not as if Martin was found somewhere he shouldn't have been. If that isn't the case, then what I know is deficient, and I'd like to know more.
Before I continue on with the subject of manslaughter, I'd first like to address your tone, towards me. The tone of a few of your statements is fairly condemning of me, and I don't think I've said anything in my prior posts for it to be warranted. The case at hand, however, has been publically divisive, particularly due to how much of the media has handled it; so I can understand how you may have accidentally mischaracterized me. That said, from what I know about manslaughter, which isn't a whole lot--I'm not a lawyer--your definition of it as only applicable "in concert with other criminal activity," is wrong. There is voluntary and involuntary manslaughter, and I don't think any of those cases must fit your description, and I'm even more certain that the latter case does not. Therefore, the burden of proof isn't as high as you are making out.
Additionally, I'm not saying that "Zimmerman is to be held culpable for our lack of knowledge." I expect the prosecution to lay down the facts to the jury, and those facts can lead to a guilty verdict of manslaughter--and I think the facts, as presented here, should lead to such a verdict.
In closing, I'd like to point out that I don't think Zimmerman is some sort of monster. I actually sympathize with him, yet I think he committed a mistake that he should be punished for. Accidents, misunderstandings, mistakes, and the unexpected happen; however, that doesn't make anyone less responsible for an outcome into which they committed and set into motion.