The 47-year-old actor was shooting battle scenes for the horror apocalypse movie in Glasgow, Scotland, with 700 extras when the actress fell to the ground in the melee.
A source told the Scottish Sun newspaper: "Lots of people hurt themselves and Brad came to the rescue of one woman who slipped. The source added: "Loads of extras suffered bumps and scrapes. The woman wasn't the only extra who was injured during the intense World War Z shoot. "Loads of extras suffered bumps and scrapes during the battle scene," the set insider revealed. "An extra playing a soldier was even hit by a moving car, ending up on the vehicle's bonnet, but fortunately he escaped unhurt."