"Creation from nothing."
A complete sentence emerged in Li Si Te's (Liszt) mind.
It was one of the Thirty-Six Stratagems, originally meaning to create something from nothing, akin to fabricating out of thin air. It was also an inspiration that suddenly struck him; perhaps the barrier of magic power was essentially "creation from nothing." However, this "creation from nothing" did not mean an unfounded "creation," but rather a creation from "nothing."
According to the triangular theory, magic power could be transformed from both material and mental aspects, which all falls under "creation from something."
Hence, ordinary flames and Fire Attribute Mana belonged to "creation from something," so it did not involve any barrier information. However, the relationship between Volcanic Super Magic and magma belonged to creation from nothing, which led him to believe that Volcanic Super Magic was a product of barrier creation.