Why is the quietest person usually the most dangerous #shorts

Why is the quietest person in the room usually the most dangerous because they're usually just observing they're literally watching everything that's happening everything you say the way you approach things and usually the quiet person will fly under the radar and nobody will really even know that they're there because they don't fucking talk so almost people think the quiet person is just someone who's socially awkward. Which may be true they're observers they're watching every fucking thing you do in a social interaction they're watching your mannerisms they're watching the way you speak and approach people they're even looking for things such as insecurities subconsciously so the moment somebody wants to start some shit with them they already got all the ammunition they need to win that battle.