Leonel had noticed the peculiarity of the salt water in the region instantly. However, he originally thought that it was just a method of warfare.
Even so, this explanation wasn't enough.
Salting the land seemed to be a bridge too far. Ostensibly, if the Sea Gods wanted to kill off the Human Race, they wouldn't be doing so just for the sake of it. Unless they were genocidal maniacs, there had to be a purpose.
That purpose should be their land, or else what was the point? But then why would they destroy this land at the same time?
If Leonel took a step back, then he might be able to assign the blame to this method to whoever might or might not be controlling the Sea Gods in the shadows. Maybe they were more interested in going scorched earth just to deal with this matter.
But that didn't feel like it made sense either.