Who cares what the Behavior Detection Officer thought, he was wrong
Who cares what the screening machine thought he was carrying, it was wrong
Who cares what behavior the TSA officers and supervisors 'noted', they were also wrong
If a person cannot simply get up and leave the TSA area if they haven't been arrested, then the law is wrong.
If the TSA can't do their job without threatening the rights and freedom of movement of a large part of the population then they shouldn't be doing it at all. All this inconvenience for an organization that in its 12 years has yet to even catch a real terrorist.