Shadows appear anytime

Hello everyone, I seek a serious answer from someone who might have heard or experienced something like this.

A person, randomly seeing shadows, human shaped. But taller like 2.5m, always seeing only in the corner of eyes, and if looking at them they disappear. It’s been for like a year, for the last time, the shadow is white. After that the person sees them no more.

I’m asking because I need to work on this person, is this a power, a weakness, how to deal if someone is like this?

Also what could be those shadows be?

Shadow people are a common phenomenon. I remember seeing things like this early in my journey, but I rationalize that most of the time it was visual hallucinations (“mind playing tricks on me”) because I was paranoid about the phenomenon (or—in my older age—I have a ton of floaters in my eyes).