I was out for a walk, when a ball of light came out of the north to the south and and changed direction straight upwards and reversed

About 6 1/2 years ago I was working as a security guard at a distribution center for a well known retail store in the city of Wilkes-Barre, PA I was working at the truck enterance in a little guard shack. I decide to go out for a little walk to stretch my legs at about 21:30 (9:30pm). As I was walking west on the enterance road I happened to look up and saw a ball of light come out from behind a building to my right. This ball of light was a very bright white and was approximately 1 mile to the northwest of me about 300 feet in the air, possibly a little higher. The ball of light was traveling from the north to the south at a speed I would estimate at about 200-250 miles per hour. As the ball of light was approaching the centre city area, it all of a sudden did what I think to be a 90 degree turn and go straight up into the air for about 200-300 feet. This ball of light hovered for a second in one position and then came back down to its previous position and proceeded back off to the north towards Scranton, PA. By the time I got to where I can look to the north, the ball of light was gone and never saw it again. What I found very surprising is that the ball of light took the same track out that it came in on. There was no noise with this ball of light. It was just a ball of white light, no other colors in with it. There was no streak or trail behind it. I am not aware of anything in the world that can do such a perfect maneuver without some variation off of its track. I would estimate the size of this object to be like extending your arm and holding a little rubber super ball or a quarter in the air. I asked around to other people I was working with that night, if they saw anything but they said no. I know I was not seeing things. Some people say maybe your mind was playing tricks on you but I don't think that is it. Like I said, it was pretty early in the evening about 2130 hrs. There had to be other witnesses to this.