Running/backpedaling may not be a pretty look, but properly done it's a really good way to take all the power out of a blitz. It's also a good technique to catch an opponent reaching and off balance. You're turning the blitzer from someone initiating the action to someone chasing the action, and when you change movement, e.g., slip to the side or angle in at the end, your opponent has to react quickly or be caught out of position. The technique is a cousin to rope-a-dope.
A controlled brisk retreat is very different from a panicked out-of-control evasion, and it's a technique Jon has used effectively for a while.