Hmm, well, it is a cat. They're pretty tricky creatures, so it might have just been able to avoid you somehow. However, if it was something else, it could be in many forms. A guardian, a spirit of some sort, a demon even. However, I'd check into it a little more before jumping to conclusions. I have around 24 cats in my neighborhood, and I'll be following them to see where they go, and suddenly, they disappear, but I know they're simply cats. Hope this helped you some!