Sequence:
1. Hitomi gets free of the window but knocks Senpai down at the same time.
2. Senpai is temporarily blinded by the pain; Hitomi turns around and kneels over Senpai, concerned for him.
3. Senpai opens his eyes.
Why didn’t the mangaka explicitly show Hitomi turning around and kneeling? IDK, because it’s boring?