First we have to accept that mind has no volume like a dot. Mind is a dot but has forms inside and it is singular. To understand, let me give you an example, assume that you have a piece of paper with a painting on it, the paper is mind and painting is state of mind as you could erase and paint different thing on it. Now crumple the piece of paper as much as you could to simple ball. The ball is mind in real form, of course the state of mind has very different form from normal, but that is what is understandable for mind.
We are intertwined since in the previous example the painting could represent a person walking so act of walking with another person who has a mind is represented as a state of Mind so the second person could experience it. Without Mind we couldn’t experience anything. Now think of whole beings, namely minds and mind which intertwined to each other, within minds decide and do things and Mind adopt itself to changes. Just put all minds and Mind on a dot which is a possibility since they don’t occupy any volume so you get the picture. There is no inside and outside for this mixture and what is left outside is absolute nothingness.