Some reason when it loaded the map to start battle, my iPhone looked like it was going to crash. My background was all that was there and the phone unresponsive. Then FingerMaze started loading up.
Same thing happened to me. When the phone became unresponsive you must have touched the screen and when it became responsive it clicked what you touched which happened to be the Mazefinger icon.
Okay, that must be what happened. I just thought it might be more than coincidence since it was another ngmocco app.