Harano didn't understand, which was no surprise. As a modern person, he'd never seen anything like this, and he wasn't a student in this particular field—come on, it's the twenty-first century, no sane person studies how to stab people with long spears, he really didn't know how!
He was just about to ask what "spear beating" was all about, when the spear formations carefully edging closer immediately gave him a real-time demonstration of exactly what "spear beating" meant: