Post by David Von Peinhttp://jfk-archives.blogspot.com/2017/05/tsbd-photographs-and-floor-plans.html
What should be clear from the diagram of the second floor is that Marrion
Baker had no sight line into the lunchroom from the top of the stairs and
could only have spotted Oswald if he had just entered the vestibule on his
way into the lunchroom. That should make it clear that Oswald hadn't been
in the lunchroom for any length of time prior to being spotted by Baker
nor was he drinking a Coke according to conspiracy hobbyist mythology.
Even though there is no way to know this, it has been my belief that
Oswald was descending the back stairs with intention of going down to the
first floor and slipping out the back when he heard the footsteps of Baker
and Truly coming up the stairs from the first floor. At that point he
decided to duck into the lunchroom to avoid being spotted. It almost
worked. Truly didn't see him and Baker only got a glimpse of him but it
was enough to raise his curiosity.