roasting coil wire

has something really weird happen tonightin the powerwagon. the coil wire right at the cap flat cooked itself in half. no misfire, no hard starts, hesitations, nothing leading up to this point. i was right in the middle of the busiest intersection in town and i hear this loud POP! then im dead in the water. upon inspection the coil wire failed right at the male end in the cap, the brass end looked perfect, not burned, nothing. got the truck home, pulled off the cap, rotor, wires, everything, and checked for carbon tracking and holes, rub marks, anything, and found nothing. put it all back together and i have a horrible hesitation off idle, sometimes, not all the time, and i noticed my tachometer pukes out when it has this hesitation. with no consistency it makes the tell tale pop pop sound like a wires arching out upon cranking to start, but only sometimes, and when it does it, i dont see any lightning shows from the cap or wires.

with that being said, i have a new cap and rotor with brass tower inserts, a month old, wires are 2 years old and have 12,000 miles on them, solid graphite core accel super stock 8mm's, champion platinum plugs, and a digital MSD 6a thats 9 months old pushing a blaster SS coil, Any ideas as to what could have caused the coil wire to burn in half? faulty wires? do graphite core wires fail in this manner when subjected to capacitive discharge ignitions? and why would the tachometer drop to zero coinciding with a huge misfire when it stumbles on off idle acceleration?