Horror scenario where two lovers are bound to each other in the afterlife and empower each other to inflict fear on their victims, each being responsible for a component of the haunting:

1. Tension and fear

2. Action and scares

Killing or nullifying one significantly weakens the impact of the other, though only makes the other more powerful and vengeful for disturbing their balance. It's technically easier, but the component of the haunting is more frequent and obtrusive.