Help me understand the concept of "worlds" and "source"

[Hinoto-no-Ryuji]

To "heal" the universe, they cause a great deal of chaos on the Source and one of the reflected dimensions to weaken the boundaries between them. If that wall comes down, everything on the reflected universe is annihilated and its aether is returned to the Source in a great deluge of chaos and imbalance (a Calamity). They believe that this aether can be funneled to Zodiark to help his resurrection.

Apologies if I'm just misunderstanding the semantics, but this actually runs contrary to my own understanding - I thought that the calamities were deliberately engineered by the Ascians to make Hydaelyn desperate enough to absorb a Shard; ie, the Calamities cause Rejoinings, not the other way around (at least, not on the Source).