Just a lucky but reckless gamble. How many times was the perp within a split second lunge from killing someone - because the cops did not contain him in one place but allowed him to roam while merely following him in a circle?
Here's a video of another incident where cops also failed to contain a perp with a knife - when he decided to use it. Try to count how many wind up stabbed!
"WARNING GRAPHIC CONTENT 18+ knife wielding man attacks/stabs police"
Holy cow.