Why is there a comma in "Man discusses his, wife's experience"

Why is there a comma after "his" in the headline? Does this mean his AND his wife's experience? Is it correct english, or slang?

"Man discusses his, wife's experience being injured during the Boston marathon bombings."

Source: http://abcnews.go.com/US/video/boston-marathon-explosion-video-attack-victim-hard-mad-18969745

It's short for "Man discusses his and his wife's experience...." It does not mean "Man discusses his wife's experience."

News headlines are trying to achieve maximum impact with as few words as possible, so they often take liberties with omitting unnecessary words, while preserving the message of the story.

This particular headline might be somewhat awkward English, but there's nothing technically incorrect about it.

This is an offshoot of the usage of the serial comma, but without the conjunction.

"Man discusses his, wife's, son's, and daughter's experience." is typical and grammatically correct. It is expected that the "and" is implicit in the comma, and the list can be shortened to as few as two items.