Is the girl one of the bosses you meet within the first 5 floors of Touhou Labyrinth? (Reimu, Marisa, Remi, Sakuya, Patchy, Meiling, Minoriko, Cirno, Alice, Youmu, Yuugi, Rumia)
Does the second girl wear a hat? Ribbons do not count.
Does the second girl have a named weapon?
Is the second girl Rumia?
Did Shou provoke Rumia?
I'm probably wrong, but I'll take a guess at it anyway. :V
Shou was flying over Misty lake when Rumia came out of nowhere and attacked her. Shou was so startled by the attack that. She dropped her pagoda into the lake. She then dove down into the lake to recover it.
Did Rumia surprise Shou?
Was it Rumia's attack that startled Shou?
If not, was it something else about Rumia that startled Shou?
...Was Rumia in her EX form? (probably NO, but just have to ask)
Was Rumia hungry?
Is that so? :V
Did Rumia Ambush Shou?
Is the reason why Shou was flying over the lake relevant to the case?
And is Rumia encased in her black ball of darkness the reason why Shou was startled?
Did Rumia say "Is that so?" in response to something Shou said?
Did this all occur in the night?
Did Shou notice Rumia in her black orb when she was in a close distance?
Was Shou disturbed to find that her pagoda didn't let her see through Rumia's orb of darkness?
As in see the black orb itself.
Did Rumia come out of her black orb when she attacked Shou?
Was the point that Rumia was inside the black orb specifically what surprised Shou?
If my constant stream of questions get annoying I can stop and let other people post if you want.