Dave and Genowrath have had a falling out, and Genowrath isn't sure why.
He'd done his best, hadn't he? He'd taught Dave magic, showed him the best way to sacrifice a goat, murdered his stepfather for him-- he'd done everything a warlock could hope of their demonic patron. Now suddenly, Dave's talking about "expanding horizons" and "wanting more," as if Genowrath isn't good enough. As if their years of working together mean nothing.
Well, Geno will show him.
He'll ensure Dave can't take on with any other demons, even if it means killing every other demon in Hell.