自分 was a genius economist, banker, entrepreneur, etc, so when he learnt Sword Arts, he interpreted swordsmanship in terms of trade, creating his unique art: Interaction: 自分 or 相手 sends an [attack] w/ a [property] ↓ Reaction: 自分 [receives] & reacts either w/ a [counter] or [evasion] ↓ Transaction: After [receiving], 自分 now [owns] 相手's [attack] & can [return] it as an [attack] or [steal] it