Considering how much blame guns get for what humans do with them, it hardly seems fair for the USA Today to completely ignore the role a gun played in stopping a man on a knifing rampage. At that link Clayton Cramer quotes a version of the newspaper's story that I can't find online but which states:
ARLINGTON, Tenn. (AP) — Eight employees were stabbed Friday by a co-worker at a Memphis suburban grocery store, and four were seriously injured, police said. The victims were identified only as six females and two males who worked at the Schnucks grocery.
Memphis Police Sgt. Vince Higgins said the man suspected in the attack was in custody after the incident that was reported at about 9:25 a.m. The suspect, whose name wasn't immediately released, was complaining of chest pains and was sent to the hospital. ...
The suspect was tackled by a witness as he tried to run from the building and was held until officers arrived, Higgins said.
However, as other news reports indicate, the attack wasn't stopped by a tackle.
Ingram, chasing one victim into the store's parking lot, was subdued by Chris Cope, manager of a financial services office in the same small shopping center, Memphis Police Sgt. Vince Higgins said.
Cope said he grabbed a 9mm semiautomatic pistol from his pickup truck when he saw the attacker chasing the victim "like something in a serial killer movie."
"When he turned around and saw my pistol, he threw the knife away, put his hands up and got on the ground," Cope told The Associated Press. "He saw my gun and that was pretty much it."
The link Mr. Cramer provided to the USA Today article (actually to news.scotsman.com) now mentions the gun, so I'm not sure if the article was updated or if the link is wrong. In any event, it's interesting that the AP and the USA Today both quote Memphis Police Sgt. Vince Higgins but have him saying different things. Perhaps, also, Sgt. Higgins learned more about the event as the investigation unfolded.