His body language and tone in the initial interaction seemed flippant for sure. Is there a longer clip?
In my searches, I have seen one YouTube video that has a few seconds extra at the front[0], but I couldn't tell you if it's actually Senator Pastore screaming "shut up" or if the author sampled some random gavels and screaming, ha.
I'd love to see the full hearing just to get the context of how big of a shift Pastore really went through, but if CSPAN and PBS both don't have it, I feel it doesn't exist at this point.