Konoka looked frightened. Did Sayaka see? If she wound up exposing magic by accident, she might get dragged off and turned into an ermine if Sayaka used that knowledge.

Nervous and giggling, Konoka decided to play it off. "Ummm... I managed to worm my way free and cut open a knot before it got too tight." And it wasn't a lie, either. She just had a magical assist to it. She was so defensive she didn't notice Sayaka had exposed herself... until right then.

"Oh! So sorry!" Konoka turned away to give Sayaka a moment to properly get her skirt on, a blush on her face.