Investigation revealed that Cole Sprinkle, 23, of Wasilla, was pursuing [Ezekiel] Johnston [of Kenai] in a white Chevy pickup. Johnston, according to KPD, was in a "Honda passenger car." The pursuit ended in the Home Depot parking lot, where Sprinkle attempted to enter the driver's side of the Honda. Sprinkle then "smashed the driver-side window with his fist." It was at that time that Johnston shot Sprinkle with a handgun three times.
The "wondering" part?
The story doesn't mention whether alcohol and/or drugs were involved. If I were going to try punching out a car window, my fist wouldn't be the first tool-of-choice. But if it were, I wouldn't try it without benefit of pre-anesthesia!