Strangulation
Taking a knife to a fully conscious individual who is standing up is going to result in a mess and very possibly excess noise. The strangulation was used to gain control over the "working" conditions. It is strongly suggestive that this tactic was employed to control where the blood went and limit the possible noise created. In the case of Eddowes, it appears this tactic was abandonned and a new tactic to gain control over the scenario was developed that still achieved similar results. Whether it was employed for speed or for another reason(s) it is not completely clear. I find a practicality about it that is hard to ignore though.
Taking a knife to a fully conscious individual who is standing up is going to result in a mess and very possibly excess noise. The strangulation was used to gain control over the "working" conditions. It is strongly suggestive that this tactic was employed to control where the blood went and limit the possible noise created. In the case of Eddowes, it appears this tactic was abandonned and a new tactic to gain control over the scenario was developed that still achieved similar results. Whether it was employed for speed or for another reason(s) it is not completely clear. I find a practicality about it that is hard to ignore though.
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