The principal has found an interesting video on NewTube. She has Rika and Haruo listen to it. Haruo decides that since the singers are more "yes" than "no," he needs to find them and add them to the choir. But the choir will have to catch them first!
To catch them and make them
join the choir, of course.
للإمساك بهما وضمّهما للجوقة بالطبع
Natürlich zwingen wir sie dazu,
dem Chor beizutreten.
Per acciuffarli e costringerli
a unirsi al coro, non è ovvio?
Pegar e fazer com que
entrem no clube, é claro.
Чтобы заставить 
присоединиться к хору, конечно.