This custom has been passed down for a very, very long time...
...
And the one responsible for all this, the monster with hands drenched in blood, had left happily after seeing a large herd of cattle lift their legs simultaneously following the roar.
For him, just that roar was enough; there was no need for further action.
As for the imminent shortage of world-famous premium beef by dawn, along with other lesser grades facing a similar shortage—those were none of his concern.
Don't think that with so many dead cattle, there'll be more meat to sell. Don't forget, that's premium beef raised with music; beef from frightened cows would have its quality affected.
Needless to say, he is unworried about what the investigative geniuses of Japan might discover—whatever happens, as long as you do enough, you gain experience. Nowadays, Boss Yan is quite experienced in doing such things, leaving no trace whatsoever.