Trap
The interesting lead is Water Giants.
Just like how the fire giants are trying to establish themselves in and around the fire city, the water giants are also trying to do the same with the Water city. The interesting part is of course the intersection of the territory.
Both cities share a bit of common territory and both sides want to take that common ground to themselves with no intention of sharing.
The humans who owned the territory before were harmonious and they didn't bother with the trivial details like that.
But the Giants are not like that.
They already had a lot of friction before Sam even put his fingers in this mess.
But his recent endeavors of destroying the exploration team as well as killing a lot of giants with water elements and Brute force definitely made the fire giants angry.