Video VFX style. A woman stands in front of the glass, mechanically and rapidly repeating a "pointing sideways" gesture like a broken GIF loop (2 loops per second). The silverback gorilla is driven crazy by this infinite loop; instead of staying still, it starts spinning in place anxiously, then angrily bangs on the glass rhythmically with both hands, as if trying to smack this "glitching" human back to normal. The scene is full of restless energy.