The number of Sea Clan returning from the coastal areas gradually increased. Compared to humans, the organizational level of the Sea Clan was on a different tier. Their sea tide was just a rough timing and direction, and then everyone converged on that point, eventually forming a Beast Tide.
Hoping for the Sea Clan to line up neatly, dividing into the vanguard, the main army, and the rear guard was unlikely. When benefits were present, everyone wanted to be in the vanguard, and during a retreat, nobody was willing to guard the rear. That's roughly how it was.
Therefore, when the news of reinforcements spread, those who received the news early started returning, while those who received it late were slower. Of course, this referred to the Golden Core and Foundation Establishment Sea Demons; the Nascent Soul Great Demons would not act rashly because they understood the risks.