My first thought when I saw that arm band was that it was an explosive detonator (well to be completely honest I thought it was like a jogger's ipod, but my first logical thought was the detonator). Then when I saw the explosives in the radio room it all seemed to come together.

Does it seem odd that they start to turn one 'bad' character just as a new one comes on the scene? Ben starts to quit all his psycho manipulation just as Keamy enters with his crazy antics and what would seem to be no moral gauge. They've done this before but each time I think the new character is crazier than ever and then they seem to top it.