Of course, my response at first was: Huh? What's that?
Given my lack of knowledge I turned to google for the answer.
Speculative fiction addresses fiction that includes Weird Tales, Amazing Stories, and Fantastic Fiction. It also may include other genres, such as Mysteries, Alternate Histories, and Historical Fiction. Speculative fiction can be a collective term to describe works of science fiction, fantasy, and horror and also addresses works that are not science fiction, fantasy, or horror, yet don't rightly belong to the other genres. - source.
A little bit down the page, it said this: When you've come across a story or movie or game that both is and isn't science fiction, fantasy, and/or horror, then you've discovered speculative fiction.
That describes Snapshots pretty well. It is Sci-fi, but at the same time not. The sci-fi elements only come into play near the end and they don't directly drive the story. There are other elements that make it fit into Speculative Fiction. Cyc has a power and is stronger and faster than the average human. But he's not paranormal or supernatural.
I will admit that I was uncertain about using the term. After all, I had to google it. But just because I hadn't heard the term often doesn't mean other readers haven't either. One thing is certain, when talking about Snapshots the thing I say the most is, "It's NOT paranormal."