Souma is really susceptible to cracking up, and even memories will put him into laughing fits. But being self-conscious about this, he always tries to hide it. When he does this again at a clothing store his friend works at, the friend asks him why he does that, especially when it's so easy to tell anyway. Later, Shun also repeats the same sentiment...
Then this is a big detour 
for you. What's going on?
إذاً هذا طريق التفافي طويل
بالنسبة لك. ما الّذي يجري؟
Wieso gehst du dann diesen Umweg?
Come mai questa deviazione?
Fica longe pra você.
Por que fez isso?
Тогда зачем делаешь крюк?