The chaser is about a guy who's madly in love with a beautiful girl who doesn't love him. He's beyond desperate to get her, willing to do anything, even something that's out of the normal, something many people wouldn't normally believe in. The guy tells him all these wonderful things, tells him how extreme wonderful things might become. Like how she'd NEVER divorce him? At the time that probably didn't sound to bad for the guy, but what about later on? When he grew tired of her? realized that he didn't want someone who would just blindly do whatever he wanted, and watched his every move, painfully taking care of him until the day he dies. The man with the potion also first describes a poison, saying that the people who bought the love potions usually came back richer asking for the poison. That kinda gives you the impression that people figured out that the love potion isn’t what they want after all, but the only way to fix it is to kill their woman. It's ironic that the man discusses the poison before even selling the love potion. the man didn't catch on.