I think he walked off because he needed to get away from what was going on, it was aggravating him!
Looking up I always thought was because you were curious, bored or interested in what was going on up where you were
looking? Maybe he saw something up there? Naked dancing girls?
He was rumored to have epilepsy, ADD, and whatever. I never saw anything that confirmed either. But back then, people
were misdiagnosed, mistreated and judged for whatever they saw fit to judge them for. That is why there was a social
revolution, because people were being hurt, suffering needlessly due to "stereotypying". Brian was an extremely creative
person, artistic and a fantastic musician who learned many instruments. I remember reading in magazines about the
Stones being constantly put down, called all kinds of names, and criticized at every opportunity and this was when Brian
was alive and in the band. Dean Martin even criticized them and so did Ed Sullivan among others. I was 14 when they
came out in 1964 so I do remember a few things sometimes.
Brian could have had problems but what the diagnoses were remains a mystery, if anything.