The Strange Undoing of Prudencia Hart [NTS]

{Prudencia Hart - Act 2 (Spoilers, obviously)}
Act Two begins with Prudencia still in hell. At first she doesn't mind much because she has access to every book in the devil's library. But after a thousand years or so, she does grow a little bored. She can look out into the Costco car park and watch the world pass by while she is stuck in the B&B. And she's alone a lot; the devil changes his bodily form often and sometimes disappears for years at a time. She knows she wants to leave and tries to reason with the devil but he doesn't listen and doesn't want to let her go. Prudencia says that she has studied the topography of hell in folk stories so almost hints that she knows better than the devil (which makes for a quite funny exchange between them). She tries to convince him to go to sleep but he says that because he doesn't have a bodily form, he doesn't need to sleep.
Her next attempt is to try and seduce him because again, that's what usually happens in folk tales (i.e. the devil has a relationship with the human he takes). After years and years of trying (again, no bodily form, no bodily desires), she finally succeeds and the devil falls asleep afterwards. Sensing her chance, she steals his keys and flees. He wakes not much later and starts chasing her and as she runs across the car park, she finds a crack in time that would bring her back to 2010. She has to realise that as in all the folk stories, she needs a knight in shining armour to save her. She reaches through the crack in time and shouts for help while the devil comes closer and tries to hold her back.
She doesn't exactly get a knight but Colin (in his pants and with a cocktail stick for a sword). So basically, Prudencia is stuck in the crack in time with the devil trying to pull her back and Colin holding on to her. Now, to fully grasp what happens next, you need to sort of know the Ballad of Tam Lin (this is a pretty good summary (skip to around 5 minutes if you just want to listen to the changing business): . And because David Greig loves his puns (honestly, check out his twitter if you don't believe me), what follows is referred to as the ballad of Co Lin.
Back to the plot: the devil changes Prudencia into all kinds of things to test Colin, who has to hold on: first, an eel (they got a glass of little eels and stuck the actor's hand in), next she turns into fire (they got out a lighter and held it under the actor's hand), next she turns to ice (they stuck ice into his pants). She goes through more mutations (that are only mentioned) and because Colin holds on every time, she is eventually released. They both fall on top of each other and pass out while the devil returns to hell.
Colin and Prudencia wake up again and, in front of Colin, Prudencia sort of passes everything that's happened off as hypothermia because she assumes she must've fallen asleep in the snow. They go back to the pub where she finds out that the woman she saw who'd sung a song and tried her to stop her from going to the B&B was an alcoholic and fell asleep with a cigarette in her hand, burning down the whole house (with her children inside) exactly a year ago and that Nick from the B&B is a swinger.
The party is still very much ongoing and the pub is heaving. Finally, Prudencia is persuaded to participate in the karaoke. Just as she is about to begin, she sees the devil looking in through the window of the pub so she dedicates her song to him and says that this isn't the devil's ceilidh but the devil's Kylie (another brilliant pun by the master). She starts singing 'Can't Get You Out of my Head', starting really slow at first with the other actors joining in on their traditional folk instruments so it turns into this weird but amazing mixture of pop and folk music.