Link finally worked for me. Not sure what the problem was. Interesting article.
My only reservation/qualification in you last reply is "that it can happen to anyone". Well, yes, in the general sense that no one necessarily knows if they have won (or lost, maybe more appropriately) the genetic lottery, and just so happen to have certain genetic allele(s) that cause the adrenal glands to over-produce epinephrine...at levels enough to put the heart into a deadly arrythmia. I mean, getting struck by lightning "can happen to anyone", as well.
Look these reports are rare, and many times anecdotal. While the MD's can explain the causitive chain of physiological events that could trigger such an episode for a person who is genetically predisposed, I don't think there is any peer-reviewed studies into this phenomena, nor real statistics. And since the general news isn't replete with reports of ordinary people falling dead in their tracks after witnessing and/or experiencing incredibly stressful or frightning situations, I think we can file this away as "possible, but extremely, extremely rare".