Reenacting a fairy tale

Here's a reenactment sequence that attempts to show what Marrion Baker told the Warren Commission:

1. Baker comes up to the Second Floor via the rear stairs,
2. He catches a glimpse of a man through the window of the vestibule door going into the lunchroom (note the impossible angle from Baker's point of view),
3. He passes through the vestibule door and into the lunchroom to confront the man.

Look believable?