 The epidemiological claim that two to three minutes was almost always required to commit a murder by strangulation was drawn from her knowledge of murders.Critics of Dr Djurovic's testimony claim that the epidemiology of death from erotic asphyxia is completely different from that of murder, since the participants try to prevent medical emergency or death, not to cause it.The statistical distribution of exact mechanism of death becomes heavily skewed towards those rarer causes which do "not" manifest themselves by obvious symptoms of emergency before the point of irrevocability, such as severe induced heart arrhythmia or massive haemorrhage.