"But - I still can't figure . . . if the spark path is basically in series with two spark plugs - how can one can fire and one fail to fire"
My response:
If theres an arcing path on the bad side of the coil (i.e. the side where the plug is that doesnt fire) the other (good side) can still fire its plug since on the side with the short (HV breakdown fault) the short provides the path instead of current arcing across the plugs gap. If you short out one plug wire the other still fires, and the same thing can happen if on one side of the coil a breakdown is allowing arcing current to flow at a place OTEHR THEN the plug.
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