At the Arizona massacre:
The officials talked about a woman in the crowd who grabbed the shooter's magazine as he was about to reload and was shot in the process.
Then, Dupnik said, the shooter inserted another magazine with 31 bullets, but it didn't fire. Two men then grabbed the gun from him.
Added later: A more correct interpretation appears to be that the woman who grabbed the shooter's magazine was not shot. Thanks for Guest in the comments for this correction.