On Saturday, August 31, 2013 2:46:04 PM UTC-4, wrote:

The cable was cut by the sharp end of the S tube through which the cable passes.
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The [ed. S-tube] end was apparently cut with some kind of rotary cutter, probably an abrasive disk and the sharp end that resulted was not dressed smooth.

The sheer incompetence and/or disregard for human life that this implies is appalling.