 Leslie and Justin meet Frank , a strange and depressed man that has constant panic attacks . Leslie begins to have doubts about bringing him to her mother and tries to call it off , but Justin insists that they should " let this unfold " . At the dance , where Andy 's ( Chris Pratt ) band Mouse Rat is playing , Frank meets up with Marlene , who is repulsed by Frank 's past , current unemployment and overall failure at life . She turns down his offer at a second chance at love , prompting him to storm onto the stage and denounce her over the microphone . Leslie apologizes to her mother for bringing Frank . She is later upset with Justin , but has trouble <unk> the reasons for her dissatisfaction . Ron ( Nick <unk> ) explains that Justin is a " tourist , " meaning that he takes " vacations in people 's lives " and only cares about telling interesting stories to impress other people , which makes him selfish . Two older women then recognize Ron as jazz saxophonist Duke Silver , but he denies it . Leslie later breaks up with Justin , which Tom ( Aziz Ansari ) takes especially hard , reacting as if his parents were getting divorced . 
