"In the light of the authorities mentioned it would appear that the trend of authority is in favour of the conclusion that in cases under the Code in Queensland or Western Australia where following on an act intended to cause some bodily harm to another some unexpected occurrence supervenes which is the immediate cause of injury to the person struck from which he dies, then if that occurrence was not intended or foreseen and was unlikely the death of such person would be an accident within the meaning of s 23 and the act in question would not amount to manslaughter.
As I have already said where the injury is the direct and immediate result of a blow intending to cause harm it is immaterial from the point of view of criminal responsibility that death only results because of some constitutional defect unknown to the person responsible for the blow.
But if there is in fact some supervening occurrence between the striking of the blow and the deceased sustaining the injury causing the death, the jury, as well as being directed that they must be satisfied that the infliction of the blow caused the death, must be directed that they should acquit unless they are satisfied that the death was not an event occurring by accident in accordance with provisions of s 23.
And they should be directed that the death would be an accident if it was not intended by the accused, was not foreseen by him nor reasonably to be foreseen as the consequence of a man's conduct."