Mr. B. has a house guest this week. Since they haven't seen each other for many years, they spent a lot of time reminiscing about the good old days. They drank tea and chatted until wee hours in the morning about almost anything and everything - about people, events and places they both experienced together.
Somehow, Mr. B. discovered that many things his friend said were not quite the way Mr. B. remember them to be. In the same way, his friend had different understanding of the events or situations that happened more than 10 years earlier.
I think the human minds can sometimes play tricks. Even when people went through the same experience, they may remember or perceive the same experience in totally different ways. There is no right or wrong. And there is no way to go back to verify what really happened. It's just the way it is.