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I've learned that the 3 overhead lines carried a total of 13,200 volts so the line that arced to the truck was carrying 4,400V.
That is not how it works. The minimum voltage to ground would be 7600 volts. There is no way that the guy was 15' away. I would expect that he was less than 15" away.
The following is from: http://www.highvoltageconnection.com/articles/highvoltagespacing.pdf
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How much spacing is needed in high voltage circuits and setups? The general guideline in common use is to allow 7,500 to 10,000 volts, dc per inch in air. When dealing with ac, the general guideline is to multiply the rms voltage by three to determine the spacing that’s required.
Don

Don(resqcapt19)