It did not take long following the events of the Amazonians' demise for Victor to realize that something abnormal was happening within his territory. First, the Raiders were brought to ruin during a single incident, with their surviving members vanishing without a trace in the days that followed such a travesty.
The Amazonians disappear in the middle of the night? Sure, the Remnants of the American Government launched an attack on their sanctuary and brought down their numbers to dangerously low levels.
But there would at least be some sign of a struggle if they were overrun and destroyed, right? How could they just disappear without any clues where they had gone off to? His initial assumption was that The Amazonians had packed up what they could and absconded into the night.