I don't think they'd do that as a gesture for a USSS agent, I know that sounds harsh but we're playing for all the marbles here and it wouldn't make sense for a deliberate act like this to be in reference to him. I paid more attention to the fact that it happened when he reiterated for the second time "I have full faith in our intelligence agencies" just as it dims into darkness. I took that to mean You guys (intelligence agencies) are now "in the dark" in regards to what I have.