Charles frowned at the line that indicated the mirror. So it may be part of the spell? But mirrors are only used by ghost and other supernatural creatures.

"Was the caster trying to summon something from behind the mirror?" Charles asked. "So the two circles would have to be correct both here and in the reflection for the thing to come out?"

It would make sense, summoning a ghost. But that could be done with one simple circle. Why this summoning needed two? And why a mirror? Now Charles could understand more of Edwin's frustration.

"Maybe it worked now because the mirror was used?" Charles mused out loud.