Cardcaptors is an American language adaptation of 
Card Captor Sakura, the original anime.  

I use the word adaptation because they so heavily 
edited the show for content (and not just 
possibly 'objectional' relationships but also 
some of the sweetest and most innocent scenes - 
probably thinking they were too 'boring') that 
Cardcaptors is a completely different show from 
Card Captor Sakura.  Some episodes are missing 
entirely and others so changed they lose their 
original impact and meaning.

The cel you are asking about shows Yukito (Julian 
in the American version) reading an article about 
martial artists being challenged (and beaten) by 
what appears to be a little girl.  The little 
girl is actually the Fight Card.  Yukito is 
worried because his friend Touya (Tori in the 
American version) is a brown belt (if memory 
serves) in karate.