Rigel flew in and landed right in the middle of the river, creating a massive tidal wave that washed and flooded the valley. He made his presence known by the Unnamed, and it was effective because they were all gathered around him as soon as the wave disappeared.
None of them were scared of him, and they stood there staring at him from beneath the white mask. None of them had any weapon in their hands, and there wasn't any stain on their attire even though they were hunting deer in the forest.
People would be terrified to be surrounded and stared at by them, even Rigel admitted that they were something else. The lingering emotions and spirits that followed them, they had no idea the faces that they were haunting. They didn't know their identity or what their voices sounded like.