Amon continued to delve deeper into the misty border using the battle puppets to gauge his surroundings. He only actively engaged spirit beasts below the Primordial grade because he could slay such beasts in a short time. If it were stronger beasts, he would avoid them.
Things didn't always go as planned, though. There were Primordial Beasts fast enough to reach his location after destroying his puppet scouts before he could move away. In such cases, he did either of the two actions.
If the spirit beast were a Lower Primordial Beast, he would fight it. He was strong enough to slay such a beast. It only took slightly longer.
If it were a Mid, he would sacrifice his battle puppets to hinder the beast and flee. He could defeat a Mid Primordial Beast, but that would take quite some time. In this place, he had no luxury for time. Other spirit beasts might come and ambush him mid-fight. That would have been catastrophic.
