https://youtube.com/clip/Ugkxe3BFpT9pFf5dUkjtFQJb0g4jjzbEaUwI this is example
this is the only thing ive seen, at first i thought he had something stuck in his mouth but hes been doing it since the beginning of the series appearantly
everyone has their focus ticks. My brother exhales pretty fast every time he goes for a kill and i tend to bite my lip.
i think it's just out of habit. yay likes moving his mouth a lot while playing too
I think it's just a weirdish habit. Maybe a stress response. I wouldn't think badly of it.