Doppelganger

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Hello /x/
I need advice on doppelgangers.
Basically, how do you deal with them?
Is it OK to tell the person that you saw his doppelganger?

background story
> about 4 years ago, tokyo
> walking home after work, about 11pm
> decide to try and take a different route
> following gps map
> get to a long street with only a couple of weak yellow light streetlamps
> walls on one side, a building on the other for about 50 meters, meaning no place to go/hide for 50 meters
> at the end is a blind corner
> dead silent, met no other person even before I got to this street
> get to the corner, and a figure appears right at the corner and passes to my left
> I looked at the person and locked eyes with him for about 2 seconds
> seemed like he was floating, keeping his head and shoulder level the whole time
> didn't realize it initially, turn my head back in front and keep walking
> realize it was my friend who was suppose to be in UK
> look back
> no one there
> feel like someone was watching me
> fuck this
> ran until I get to the main street with a convenience store and cars driving by

Unless that was a person that can run 50 meters in 2 seconds, what the hell did I see