Kohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.
Where did you learn to 
handle a spear like that?
أين تعلمت حمل الرمح بهذه الطريقة؟
Dove hai imparato a manovrare così la lancia?
Onde você aprendeu a usar uma lança assim?
Откуда такое владение копьём?