So you added a "not brick wall" and labeled your position "not your view." And drew a reflection that is not happening at the window.
That . . . really doesn't help.
He's simply ruling out the possibility of a direct reflection of something in the same room. There's a wall there.
I am loathe to weigh in; there's quite a bit of rancor here, and I fear if I offer an opinion the OP doesn't like I may likewise suffer the fate of Burial By Giant Text.
I still don't really see a figure in the original image - let alone something discernible as a security guard. I kind of wish someone would point out to m what they see.
I suppose, if forced to acknowledge there is a figure there, I might be able to trace some shapes - but for all I know this is a trick question and this thread is really a study about the Power of Suggestion.
All that being said, But the only thing I really have to offer is that I can't shake the feeling that there's a double reflection - as if there are two parallel plates of glass, close together.
Perhaps this is one of those windows where
the blinds are sandwiched between two panes of glass and also act as outside double-glazed weather-proofing. (Would not surprise me if this were the case in a hospital situation where any random object could turn into a hazard/weapon quickly).
Example: