I don't know if I can think of a worse weapon to threaten someone with. They're heavy, cumbersome, they require you to keep your hand on the trigger, and they're likely to harm you just as much as they are whoever you're chasing.
She had been following him, eventually trapping him, and instead of driving off when he gets out WITH A FUCKING CHAINSAW she stops to argue with him while he proceeds to frighten the living shit out of her poor kids.