Aloy's Memories are used against her!

The gas is meant to break down her will.
It will end her fighting- at least that's the plan.

One of the ways it does so is that it manipulates the memories of the humans.

Aloy once broke into a Machine Facility.
She freed a captured Resistance Fighter.

The woman was locked up in a water-filled tank with her gear on display around her.

The gas manipulates Aloy's memories by making her see herself on display like this.

She tries to shake it off.

She knows that this didn't happen.

Regardless, this keeps her occupied until she gets to the next Station

A new plight is prepared for her.