I have re-shot the video reference and have determined the primary Position of Significant Stance (POSS).
In the selection of the POSS, I prefer that when the character speaks the first sentence, they are in a state of shock and confusion, conveying the situation to the person opposite them. During the second sentence, the character carries a certain degree of anger. The final sentence is delivered with extreme anger and a hint of madness.
video reference
During the video reference shoot, my primary focus was to portray the three emotions mentioned above, incorporating a forward step to complete the transition between each emotional state. With each step the character takes, the emotional evolution intensifies, culminating in extreme anger. However, it seems that the shooting angle I used differs slightly from the angle in my reference.