"The basic proposition relating to causation in homicide is that an accused's conduct, whether by act or omission, must contribute significantly to the death of the victim [case cited]. It need not be the sole, direct or immediate cause of the death. However, when the death is not caused directly by the conduct of the accused but by something done by the victim or by a third person in response to the conduct of the accused, there is a question whether the chain of causation has been broken. If the response is a reflex or automatic reaction to the conduct of the accused, the chain of causation is not broken. It is also well established that the death may be held to have been caused by an accused's conduct though the direct or immediate cause of death is a final fatal step taken by the victim where that step is taken in an attempt to preserve himself or herself from physical harm which unlawful conduct on the part of the accused has induced the victim to fear, provided the victim's attempt at self-preservation is reasonable having regard to the nature of the accused's conduct and the fear it was likely to have induced (or, as I would prefer, provided the attempt is proportionate to that conduct and the fear it was likely to have induced): [cases cited].