Further down in the article:
The manager denies that the worker used the stores own weapon. The only gun we have is pricing gun to price the items, Rodriguez joked.
For what purpose is Rodriguez B.S.-ing? What am I missing?
I believe the customer was referring to the intruder -- i.e. "Wow, if the worker didn't shoot him, he could have shot the worker!" -- an affirmation of the worker's right to have shot the perp.
This looks like the same event as this other one:
http://www.freerepublic.com/focus/f-news/2858926/posts
How could two reporters cover the same story and get it so different?
In this story the shooter is working. in the other one he was sleeping in a crawlspace.