I thought that electronic pacemakers just monitored the heart and stepped in when required. I'm not an expert, but I don't think that pacemakers were sitting there initiating every heartbeat (how long would the batteries last?).
So if a pacemaker is "stopped" by a taser, then it might not affect you until some other time.
On the other hand, if the taser stopped your heart, then you would IMMEDIATELY collapse, would be unresponsive, and would die.
If I'm right (?), then one theory is a stretch and the other fits the reported facts.
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