MAeSTER

SIGHTING #1:
I had met up with my friend one day and we were just gonna continue building in our creative world like any other day. I had never done a survival world in all of my life! NEVER HAD I PLAYED SURVIVAL! So that day I built up my courage and I said to my friend, "y'know what? lets try a survival world!" So, we made a survival world like any normal player would. We played around for a few in-game days, we geared up, and got some iron. 
But there was one night when it all started... it was the night my friend couldn't find a bed for the night. I told him to go find our sky-base (that's what we called our old base) because there was a bed there. Then I heard an enderman teleporting rapidly! There were particles in random places! I was really creeped out. Then I heard a slow sound of a door creaking open. By this point I was ready to sign off. But then my friend found a bed and we survived the night.
The next in-game morning, I decided to go exploring the birch forest that was near us. When I was exploring it, somehow i was going in circles when I was going in a straight line! Later, I was just harvesting sand for glass on the beach, and I heard a cave sound???!!! But I was not even in a cave! I decided to ignore this. a few mins later, my friend was crossing a desert with absolutely NO WATER in it, then, somehow he heard splashing! All of the sudden chinks were not loading properly and I saw the name tag: MAeSTER
SIGHTING #2:
About three weeks later, we found a village in our world. Before this happened, the weird chunk loading with the name tag: MAeSTER happened again. My friend had just tamed a cat, but when i went to see it, IT WAS WALKING IN THE AIR!!! That is the last I saw MAeSTER lately, I haven't seen him since.