I one time saw a guy jogging down the side of the road, with his road bike beside him. He was in his stocking feet (i.e., wearing only socks and holding his shoes in his hand). I slowed (I was on my bike) to offer assistance. He declined and said he flatted, had no tube, and was on his way home. He had called his son, who was en route to pick him up, he was just trying to make use of his wait time.
So...if attacked, how quickly can you kick off your shoes? I imagine (although perhaps I'd have other things on my mind at the time) that I'd try to ditch my shoes and run in my socks, if I couldn't out-ride the guy to begin with. I don't really like my shoes, anyway!
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle