I was in a hallway. To my north was a door with a Wraith in it. To my south was an empty hallway square, and to my se was another Wraith. Both were undamaged with no status effects. Neither had hit me yet. I had not yet zapped anything with my +3,+3 Mace of Wraith Slaying.
I tapped on my character, chose Zap, and hit the north arrow. I saw the white poof graphic on the north Wraith, saw scrolling text that I had defeated it, and then the app quit.
When I relaunched, I had reverted to having just arrived on the level.
Game version: 1.5.
Hardware: iPod Touch.
OS: 3.1.3.