Liza and Jax are here for one purpose and one purpose only and that's to lure Angelo to their side so that he can open the doors to hell for all demons. That little spunk that happened only managed to let out the most ferocious of demons but what they need is to get the mothers of demons out, the powerful jinns, the seven princes of hell and lastly, their master, the Dark Lord, Lucifer Morningstar aka The devil.
But they figured since they're going to be in the human world they're going to learn how to be human so they don't draw attention to themselves. So far they've been intrigued by what Joshua has taught them. Joshua has shown them magazines, weird technology, and movies where humans do stupid things like cry and fall in love which is something demons are never going to do because they do not have a soul.
