Alastor quickly realizes that his plan to reach the faeries has a really big flaw in the shape of thorny walls. He sends Blacking for a quick trip eastward, to confirm what he already knows: the wall does not end in hat direction either. When he returns, he asks him to go above, trying to spy the depth of the defensive perimeter. "Try and see if it ends, but be careful, and do not venture beyond where you an see the way back".