another customer is in the store. >> the woman had no idea what was occurring when the individual attempted to rob the store and granny coming to the clerk's rescue. she was clueless. >> granny finally lets go of the scanner to look for a more powerful weapon. >> an additional weapon to use, against the individual. that she couldn't find. >> instead granny grabs the scanner again for one last whack as he runs out. the intruder flees with about $100 in cash and a hot-headed senior on his tail. >> she really didn't realize in the heat of the moment what she was doing, she said. she's glad she did it and she's glad no one was hurt. as do we. we like to put the disclaimer that we don't advise this. >> because of the suspect's past criminal record, police officers easily recognize him from the store's security camera footage. mark mcginnis, age 34, is charged with one count of unarmed robbery. the case is later dropped when