I’ve never seen that clip. How odd? No one I know over the age of four would ever make that face/gesture.
Seizure prone people, who are aware they are seizing, are given coping techniques and they generally master those.
If you notice when she freezes, or has a seizure, you'll hear her laugh and or cackle thereafter..and diverting the attention to something else. Which is what she is doing in that former gif.
Here she has gone into the freeze zone...meaning she's facing something she thinks she can't see herself getting away from, so she freezes. (Dissociates)..which her handler quickly breaks by touch) and then telling her she'll "be alright'..'keep talking'...her pressed lips also reveal her awareness of what just happened...