The criminal justice / mental health field being what it is, I do not find it surprising in the least that a reviled kiddie-fucker would be allowed, by several levels of people involved, 15 minutes alone, along with plausibly accidental access to a means to kill themselves.
The breaking of the hyoid bone is, in fact, not uncommon in hangings. Nor is the breaking of the cartilage. Nor is hemorrhaging in the face or eyes. Nor is blatant disregard for the fate of a paedophile, who in nobody's right mind could conceivably be innocent.