Alduin opened his MAW to download the earthbones and their blood, the men and women of the land. And the tree-mountain-horn of Snow Throat let out a SHOUT which cracked the heavens and cast Alduin into the <now> space, which is suffering-sunset-(knowledge-of-death.) The scraping LIMIT of time constriction caused a feedback-error-spiral in Alduin's wingspace, and he was forced into the dust-ashes-(grave.) Although it proved to be an effective strategy to shortly stall doom, Alduin was also strengthened by his long stay in Sheol. It helped him commune with his fallen dragon kin, and made it easier for him to call on them when he returned.