Precisely because of the fundamentals with 〜からこそ
Grammar Explanation: Precisely because of with 〜からこそ

During a training session, Tsubaki quickly subdues Asagao. Sazanka uses this opportunity to launch a surprise attack, only for Tsubaki to anticipate it and take her down as well.
- ツバキ:
- 「不意をつくばかりじゃダメです。」
- “You can't just rely on surprise attacks.”
- 「基本があるからこそ奇襲が活きるんです。」
- “It's precisely from having fundamentals that surprise attacks become effective.”
- サザンカ:
- 「はい…」
- “Yeah...”
Tsubaki is teaching that being clever or tricky (using surprise attacks) isn’t enough on its own. True skill comes from mastering the basics first, which then make those surprise moves actually work.