David speaks about how there are three realities in any conversation between A and B. 1) A’s intent 2) A’s behaviour 3) Impact of A’s behaviour on B. A can see 1 and 2 and B can see 2 and 3. The challenge often happens when A makes up a story about 3 or B makes up a story about 1. David likens this to how we play tennis and urges us to stay on the same side of the net (2 being the metaphorical net in this case).