(Shorti) Paranormal- Yeti? Alien? or Giant?

I CAME ACROSSED THIS ARTICLE THAT HAD A BUNCH OF POLICE OFFICERS RECOUNTING STORIES OF THEIR PERSONAL EXPERIENCES WITH PARANORMAL ON THE JOB. After reading this one story, I started to look up tall grey man stories. I cam across several all of which are completely different encounters and could be different creatures, but they all still have a similarity that I just can’t put my finger on. Is it Aliens, Giants, Yeti’s, or something else entirely I'll let you decide…..