Knife attacks are very difficult to defend against, especially on crowded sidewalks.
Maintaining distance and being aware, are good steps, but edged weapons are difficult to react to, in close quarters.
True, but he was walking behind his buddies and probably not paying attention. I wonder if their guns are even loaded.
Remember when Bush put all the Nat. Guardsmen in airports in response to 9/11? They had unloaded guns.
Now the TSA are not only unarmed, but lack brains as well.