Thanks for the video of the Air Trans DC-9 thunderstorm incident. ...
It mentions there would be an investigation as to why he continued that direction. Do you know the outcome?
There is a summary of the incident on the AOPA site that you might find informative:
AOPA Online: Too Close for Comfort
Not mentioned in the summary was that while the captain, Benton West, was set back to FO after the incident, he retired as a captain when he turned 60, about 4 years later. Shortly after retirement, he died in a traffic accident.