that’s the bodycam of their Lieutenant. given his location, it is possible that he recorded audio, but since he was around so many Secret Service agents, it is possible that they muted all audio to prevent sensitive information from getting out. then there is the possibility that he just never prompted his camera to start recording audio, since I think we have at least one other bodycam with the same deal.
So for my proof that’s the Lieutenant.
Bodycam BWC2-122104
Bodycam BWC2-122104
Lower right: Matthew Pearson
Per the PD website.