Ok. I was playing around in ZC 182 using secret combos, and this ring appeared temporarily for no reason at all. For some reason, I had a notion to press the ctrl button. Then, this ring appeared out of nowhere, and it looked like it was pinpointing something(closed in on a random point on the screen).
Ok, just press the right ctrl button, or hold it for a second and release. This is freaky.O_O