I was doing a Help Kiosk dungeon in Khrysalis and the other team members abandoned me. I didn't have enough cards to completely clench the victory, and the boss had about 3000 health remaining. It was so close to being done. Since it was a KH dungeon, no one can teleport in to help you. I wavered back and forth on whether to hire a henchman, and I finally did it at the last possible second.
But evidently I was so close to the end of the 30-second planning phase that it caused a glitch of some kind. The counter was either at 1 second or 0 seconds. The Henchman never spawned. It just launched into the next phase, with me left standing there, alone. I took a screenshot immediately.
As I had feared, my crowns history indicates that I was indeed deducted 100 crowns for a Level 70 Balance Henchman.
I'd like to have those 100 crowns back, but more importantly, I'd like this glitch never to happen again.