Why does the grudge slide down the stairs and not walk?

In the context of Horror films, particularly "The Grudge," the entity often slides down the stairs instead of walking to emphasize its supernatural nature and create a sense of unease. This movement style suggests an otherworldly presence that defies the laws of physics, heightening the tension and fear. Additionally, the sliding motion can symbolize its relentless and inescapable pursuit of victims, reinforcing the idea that it can traverse spaces in unsettling ways.