You might want to read the story again - the person who called 911 reported that the driver had tried to run the guy down. That wasn't just something that he made up.
This kind of thing happens 5,000 times a day, with people calling in, parroting what they "heard."
For all you know, the 911 caller could have been the shooters brother.
Ya see what I mean Bob?
Why would anyone think the guy opening up in a supermarket parking lot was an undercover cop?
I'll tell ya why Bob, it's because many times when people call 911, they are just parroting what they heard occurred, and are just passing on bad information.