northampton, england. it's a bold and brash robbery in broad daylight as three sledgehammer-wielding thugs wail away at this jewelry store front. and three getaway drivers on mopeds rev their engines. it appears no one can stop these helmeted hooligans from their brazen afternoon heist. that is, no one except for super granny. >> i'm exceedingly feisty. i know how to smack your hand if it's in the wrong place. >> reporter: her name is ann timson. and cloaked in red, flying down the street with the greatest of ease, the 71-year-old british granny vigilante decides to take justice into her own hands. beating the armed bandits with the only weapon she has, her handbag. >> it was just instinct. and i'm just swinging my bag to the left and to the right. i was angry. i was angry that they dared to do it in daylight like that. >> she misses with her first few swings. but then as the would-be thieves try to get away, one of the scooters topples over. >> so i was able to whack him a number of times. i realized then