Weak respiratory muscles may suddenly fatigue, producing precipitous respiratory collapse. Elective intubation is preferable to emergency intubation or respiratory arrest. The standard 20/30 rule (FVC less than 20 ml/kg or NIF less than 30 cmH20) are the best indicators of the need for ventilator support.
Imminent lawless action is a term used in the United States Supreme Court case Brandenburg v. Ohio (1969) to define the limits of constitutionally protected speech. The decision overturned the decision of the earlier Schenck v. United States (1919), which had established clear and present danger as the constitutional limit for speech.
For Holmes and the unanimous Supreme Court, speech whose aim is to cause violence or damage could be restricted. Subsequent decisions tightened the tests for what might be considered incitement to violence. Guidelines spelled out in 1969 added three factors: to be subject to restriction, speech must have the intent and the likelihood of causing imminent violence. The cannibalism case is debatable, but another recent example was clearly deadly.