Strange lights over Lake HuronWhile fishing off the public pier in Harbor Beach Michigan this older man who was behind me and facing south exclaimed something like what on earth is that. I turned and looked in the direction he pointed which was about dead south. There were two lights at a distance about 15 degrees off the horizon moving in a general northeast direction over Lake Huron.They seemed to be playing a game of tag with one leading and the other following but gaining ground then overtakeing the lead light and the roles reversing. The lights changed back and forth from about a violet color to yellow. Distance and size were hard to judge but they appeared about the size of a penny held at arms length. Their speed and course were erratic but the general direction of travel was northeast. There was no sound that I could hear but it seemed these objects were at quite a distance.This went on for about 5 minutes until they were almost dead east of us then they shot straight up at incredable speed and vanished from sight.I have been a sceptic about this type of thing and still am to some degree but I cant imagine what "normal" thing these lights could have been.