That was the second question I had when reading JFK's post. The first I had was "What if you are attacked by more than one assailant?"
It is folly to think that banning high cap mags and assault weapons will remove them from our world. That horse is not only out of the barn, he is 9 States away.
On an interesting side-note, we have been selling the crap out of high caps since the Giffords shooting, and supplies are starting to dry up. Knee-jerk reactions on either side of the issue are a gun dealer's best friend