I almost always take pause when someone famous passes away. My mind whirs while I begin thinking of everything (s)he did or said. It's true about people I know, too.
But this came as a shock, plain and simple. Rarely has someone this relevant, this current, gone so suddenly.
AB crammed about 120 years of guts and work and lack of fear of confrontation into 43 too-short years. Honor to him. Condolences to his family and friends.
And everyone else is going to have to step it up a notch from now on.