She's my spirit animal
I seriously doubt the exchange was as abbreviated as they say.
I'm going to assume the salesman started talking, and wouldn't let the woman get a word in edgewise. After several minutes of mounting unease, the woman finally had to suspend any natural impulse toward politesse and slam the door.
Assuming the woman was NOT an Olympic athlete, and she was not able to retrieve a gun and point it at him in the second and a half it takes to tick a box, I'm going to further assume he spent some time screwing around on her stoop, at which point the woman, transitioning from irritated to terrified, finds a toy gun and tries to get him to leave her property.