OK, this particular one I think we all have to agree wasn't an assignment. She just nailed him to the wall because it was the only rational response she's become that desensitized.
But that's where the comedy of this mainly comes from . . . the satisfaction of watching as typical urban offenders, who when you experience them you think "Die you bastard!", actually get theirs. I've wondered all along why some of the commenters seem scandalized by the black humour.