As you guys listen to Kiryu's explanation of what happened. You will know based on previous knowledge that this was the haunt manifesting.
As a side note, haunts are typically re-occurring and difficult to remove. I think the rules as written are harsh, so I make it a little easier. As you guys investigate what is causing the haunt, you will receive clues as to how to stop it. The final removal of a haunt usually requires holy water, or a specific spell that would be appropriate to why the haunt is there (such as remove curse, or sanctify).