Consider this conversation:
Tom: This is my neighbour, David.
David: Hi. I’m his neighbour. Call me Dave.
Harry: Harry. Nice to meet you, Dave.
David is Tom’s neighbour from Tom’s perspective. So the focus of the conversation is with Tom. But in reality we tend to forget (or in Lakoff and Johnson’s term hide) the fact that Tom is also David’s neighbour.
Any piece of dialogue must assume a perspective. If it didn’t they would be difficult to understand. It must highlight some facts and hide others. Sometimes this highlighting and hiding is deliberate. Sometimes it is unavoidable.