Video shows an armed bystander confronting a knife attacker who allegedly injured 11 people at a Walmart in Traverse City, Michigan, on Saturday.

Questions remain after a man went on a rampage at a northern Michigan Walmart on Saturday, stabbing 11 people in Traverse City. The suspect is expected in court on Monday.

"I'm still sitting and grappling with the weight of realizing that it was kind of a life-or-death moment," said Julia Martell, who witnessed the stabbing, which wounded 11 people.

At least 11 people were stabbed in a bloody scene inside a Michigan Walmart Saturday night — causing terrified shoppers and employees to flee — before a brave armed citizen helped detain the knife-wielding maniac, according to police, witnesses and harrowing video.

A Walmart employee was helping a customer check out when she heard a warning that someone in the store had a knife.