Grey-Bearded Osama Watching Videos of His Youth

The Pentagon has released video found at Osama bin Laden’s home. It shows a grey bearded OBL watching images of a black-bearded OBL engaging in jihad.

The video has to be less than two years old: note the juxtaposition of images of Obama and Osama at :29.

And if this is more recent–that is, if this is an image of OBL watching videos at his compound in Abbottabad–then it should put the claim that OBL lived in a “mansion” to rest.

Can anyone explain what the repeated image of some kind of signal is (it first shows up at :05)?