[RunKC]

I can definitely see how the runners didn't react to this. Several runners do the same thing I do when we run, which is listen to some music on full blast.
I do this because I hate hearing my breathing and it just keep me going.

Running like that at the very end after 26 miles has got to be one hell of an adrenaline burst for anybody.

So they probably didn't hear the blast and they barely noticed the bombing until 5 or 10 seconds after it happened.

Really sad stuff though.

In 2001 people started being scared of flying. In 2012 people started being scared of going to midnight premieres. Now people are going to be scared of doing about any damn thing in a major public event.