Psychiatrist tells Taser inquiry Dziekanski suffered delirium [LINK]
My rule-of-thumb would be that the authorities may list as many contributing factors as they wish: pre-existing medical conditions, athlete's foot, lack of sleep, dandruff, requires Gatorade, delirium... Who cares?
But do not confuse contributing factors with cause-and-effect.
Albert Einstein: "The only reason for time is so that everything doesn't happen at once."
Another timeline (approximately to scale, many hours versus a few minutes):
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