Lol, you still haven't explained how you magically know exactly where Officer Baker's affidavit description-------"As we reached the (...) floor I saw a man walking away from the stairway"-------places him and the man at the moment Officer Baker first sees him:

It is
you and you're made up hoax that wants the encounter anywhere other than the second floor lunchroom.
It's
you insisting it took place on either the third or fourth floor (notice how vague this is, as if Baker couldn't recall properly)
We know it didn't take place on the fourth floor (Dorothy Garner)
So it's
you insisting this encounter takes place on the third floor.
So why don't
you tell us where this man was who Baker reported encountering in the TSBD.

Is the man at the top of the stairs (where DN) is?
Is the man on the other side of the door near the top of the stairs? (Where it says "Hall")
Is the man walking towards the "Up" stairs?
Where's it gonna be Alan?