The only place where someone with a trait like that could possibly hide for such a long period of time was the water treatment plant, but that wasn't the only reason why Uriel thought that was the case. It was located right in between the east city gate and the synthetic food processing factory.
Uriel had no clue of what circumstances could lead a hunter to hide for such a long period of time, so he assumed that the woman just fled to wherever she felt the safest, in other words, the nearest body of water. That also meant that she probably died on the run, but that that didn't change anything, because he wasn't actually looking for her but for the cryptid that killed her.
