Dang.
I like the concept of the story and I like how it moves fast as it pertains to the idea of the title being a "chase", but I feel it went too fast.
There is a beginning, middle and end, of course, yet I believe there is some missing material that would enhance the story such as a strong build-up describing actions that take place in the middle and further questioning/back-of-the-mind fear for the character that can settle at the end. The beginning was pretty darn neat and I like that it was straight to the point/action.