At this time, it is unknown just what happens on a Shard prior to a Rejoining. Really, we don't know much of anything about what life is like on other Shards. The most we know is that Ascians go to other Shards to meddle, and that that meddling sometimes causes a Flood. Since Ascians don't actually want Floods to happen, they must be meddling for other reasons. While what those reasons might be are unknown, we DO know that Ascian meddling on the Source usually has the purpose of introducing more chaos into the world, in the hopes of eventually causing a Calamity to occur.
Calamities are said to thin the barriers that lie between the Source and a Shard, which is what allows the Shard to be reabsorbed into the Source. It's not out of the question to speculate that having a Calamity occur on BOTH sides of the barrier would be more effective at destabilizing it than would doing it on just one side or the other. By that logic, it would make sense to assume that the Ascians on the Shards are trying to trigger Calamities to coincide with the Calamities on the Source.
However, that seems like it would require an awful lot of coordination, and Ascians are also known for being rather independent from one another. They're not great team players, each having their own schemes and ambitions (even if their overall goal of resurrecting Zodiark seems to be pretty universal among them). That would be a point against the idea that the Ascians on the Shards are trying to trigger Calamities. Every Rejoining has coincided with a Calamity on the Source. If one happened on a Shard, but not on the source, it did not cause a Rejoining.
Anyway, I'm rambling a bit, but the bottom line is that we do not know the answer to your question, and no current source of lore provides an answer. We can only speculate at this point - but since we're going to a Shard next expansion, it's at least possible taht some of those questions will be answered. It'll be interesting to see how much of the history of the First Shard we're able to learn, so we can compare it to what we know of the history of the Source.



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