At some point Margaret lost track of all the astral projections Harald had made in the last month. So it could happen that one of them appeared out of the blue. This was also problematic because they quickly learned how to spend their time in another place that was not nearby the main body. So they started roaming around the neighborhood and pestering other wizards.
This circumstance can lead to precarious situations, for example, if you sit too close to a ledge or window. All it takes is a little jolt and you find yourself in the astral night forever.
The Wizard Ministry likes to thank 0xtjo for providing the perfect shade of BLEU to work with.