So you're suggesting that the jury acquitted him on the basis of evidence that would have caused them the convict a non-policeman?
There's a strong likelihood.
I see!
There are, there really are, a lot of people who think that because the police do a difficult job that they really should be excused behaviour which others are not.
Are there? Fifty years ago, you would probably have been be right but the impression I get is that the bulk of public opinion has swing entirely in the otehr direction.
In any event, as discussed below, I don't think that the facts about what this policeman did are particularly in dispute - what the jury had to decide was the 'legal' question as to whether those actions (which probably resulted in the death) were ones which could reasonably be expected to result in death or serious injury - regardless of who was responsible.
AIUI, manslaughter does not require intent or premeditation. You strike someone and cause their unlawful death then you are guilty of manslaughter, whatever your intentions were or were not.
As you say, there does not have to be intent to kill (which would usually be murder, anyway) or even to do serious harm for manslaughter to have been comitted. On the other hand, being the cause of someone's death is obviously not always manslaughter. As you say, it's all crucially dependent upon whether the death was 'unlawful' - and, as I explained yesterday, one certainly cannot rely (in a criminal court) on a coroner's court ('balance of probabilities) verdict of "unlawful killing".
'Grey area' cases of this type are pretty common. Person A does (or does not do) something which results, directly or indirectly, in the death of person B. If what Person A did was not something that would 'normally be expected' to result in death or serious injury, then it is not 'unlawful killing', hence not manslaughter, and may not even be a crime at all. An example might be a very minor assault (e.g. a light punch to the abdomen) which, as a 'fluke' consequence of very bad luck, happened to result in fatal damage. In such cases, the jury therefore have to make a decision about whether the act in question would 'normally be expected' to result in death or serious injury - and one can but assume that, in the case we're discussing, they decided that it wouldn't. As I said yesterday, if I can get hold of the judge's Suming Up, that may be very illuminating.
Kind Regards, John