Sounds like a "perfect storm" for Rowland to make up a porkie to kid his wife:
"We talked momentarily of the incidents with Mr. Stevenson, and
the one before that with Mr. Johnson, and this being in mind we
were more or less security conscious. We looked and at that time
I noticed on the sixth floor of the building that there was a man
back from the window, not hanging out the window."
"We had seen in the movies before where they have security men
up in windows and places like that with rifles to watch the crowds,
and we brushed it aside as that, at that time, and thought nothing
else about it until after the event happened."