With Lu Zhen, Yato, Katsuo, and Fudo gone, only the actual combatants for the battle were now left behind. The Kobold King stood still and didn't make a move yet. In its opinion, it was beneath it to make the first move when facing off against some low-level creatures. As for Sato, it was too risky for them to take the first action, hence the resulting stand-off.
*Bang*
At the moment one would least expect it, a ray of red light blast forth from Sato's side and struck at the Kobold King. Not bringing shame to its strength, the Kobold King had already conjured up a green shield when the day was in front of it. The earlier explosive sound was was a result of the green shield being destroyed by the red ray. However, the red ray was also forced to dissipate after the explosion.
Taking it as the sign to kick off the battle, Sato had already charged towards the Kobold King to engage it in battle.