Sakura stumbles on to Mizuki-sensei and finds out that the reason why Kero wasn't responding to her calls was because he was talking with her.

Episode 44 is the first of three episodes that marks the end of the 'Clow Card' Arc of the Cardcaptor Sakura saga. In this particular episode, Sakura, Syaoran and Tomoyo head to Shiba Park to watch Yukito compete in an archery tournament. Miss Mizuki, Sakura's teacher, is also there as a competitor. After sensing a strong presence during the finals of the competition, Miss Mizuki loses her concentration and the match to Yukito. Of course, as with Mizuki's other appearances in the anime, she's not just at the park for a day of relaxation. Mizuki knows that the Final Judgment is about to occur.

I had the background for this scene for years when a cel from this sequence popped up at the beginning of the escalation in prices from this series. Imagine my shock when this hit $70 on Mandarake when, maybe months earlier, it would have never hit $50.

From Episode 44 - "Sakura to Kero to Fushigi na Sensei" (Sakura, Kero & the Mysterious Teacher).