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...
You can go ahead and finish.
يمكنك أن تذهب وتنهي أعمالك
Du kannst für heute Schluss machen.
Mach dir noch einen schönen Abend.
Ya puedes irte por hoy. Buen trabajo.
Ya puedes irte por hoy. Buen trabajo.
Tu peux terminer.
Merci pour ton aide.
Puoi andare a casa, 
hai fatto un ottimo lavoro oggi.
Pode encerrar por hoje, se quiser.
Можешь на сегодня закончить.