(Willow smiles and walks over to Buffy and Spike. Giles: A spell? Spike: Giles, make her stop. Watch it! Willow! Xander: She told me I was a demon magnet, a-and you two should get married.
Plan: A: Giles; Q: Who is blinded by Willow's spell? A: Xander; Q: Who is made a demon magnet by Willow? A: Buffy; Q: Who and Spike fall in love and get engaged? A: her mistake; Q: What does Willow realize after her spell goes awry? Summary: A spell by Willow goes awry, blinding Giles, making Xander a literal demon-magnet, and causing Buffy and Spike to fall in love and get engaged. Once Willow realizes her mistake, she goes about reversing it.