maybe this is a good example but just to make things simple:

Observation: Somebody is being loud.

The camp of IM: it's an expression of his discomfort he's using Si. Another of the same camp would say, it's an expression of his emotions, it's Fe. And this continue's until all 8 IM's have been accused of being the reason for being loud.

The camp of behaviour: everybody says, he's loud, so more likely extravert than introvert.

simply put, IM camp looks for motivation behind the scenes, these are not visible so everybody invents their own idea. Behaviour camp looks at correlation between behaviour and type.