Why are you asking me what testimony I'm referring to, and when it was given, when the very first post in this thread says that Witt testified before "the HCSA, Monday, September 25, 1978"?
Now that you have that basic info, you can easily look up his testimony for yourself with a Google, and compare what he says he was doing when the shots were fired and what the UM is seen doing on film and in photos.
I'm not going to do the work for you, since I really have no interest in arguing with a sarcastic lone nutter, about this or anything else.