Aw, HELL YEAH! Fairy Wing SPARKLLLLLLLE!!!...!
This is the introduction of the concept that Nanase's fairy doll spell has spells of its own. I suppose they could be described in many ways, and might not TECHNICALLY count as spells within the lore of my universe if I were to write some manner of technical manual, but darn it, I'm going to call them spells, and I'd be the one wrighting the manual, SO THEY'RE SPELLS, DARN IT! TAKE THAT, HYPOTHETICAL TECHNICAL MANUAL I HAVEN'T WRITTEN!
This also establishes that Nanase's "I have to have been there" limitation extends to her having only been there in doll form. It's possible this is worth remembering.