As the framing shifts, Navarro keeps Vidal in the depth of field, blurring Mercedes in their shared MS.
She continues to be out of focus when Vidal orders her to sit down, and when the camera tracks her as she stands up, the audiences view replicating his sexist blindness to her, she is second class, her existence does not matter and he will kill her with no remorse.
The sequence is all in one take, bring the tension and fear that Mercedes feels onto the audience.