Ryuuko paused, not having considered that. To her limited knowledge, the arts seemed more or less the same: you drew specific symbols, imbued them with mana, and that had some effect. But from Tomoko's answer, it seemed that there was more of a separation than she had assumed? In that case, perhaps here assumption that the same person was behind both was misinformed... had someone been trying to surreptitiously sabotage the theft? Or maybe they had been wrong and there wasn't an onmyouji at all?

"Though the evidence found at the site was undoubtedly a fragment of ofuda, I cannot say for certain whether it was indeed a traditional design or whether some foreign rune was imprinted upon it," the purple-haired girl admitted, "Or it might be that a second magic user was at work here, though the thief's injury and your maid's lost memories hide whose side they were really on."