Something was happening to Shiba while Eini was still getting ready to cast her Law Skill.
He was hearing voices, but he wasn't hearing them through his ears nor through Spiritual Sense.
Those voices were speaking directly to his soul.
It was a strange feeling, but he felt that it had happened before.
"Yes, it was before meeting Master Liye, when I survived after everyone else died."
Shiba couldn't remember those moments clearly before, but suddenly, everything became clear.
"Fight!"
"Don't give up!"
"Don't die like everyone else!"
"As long as you leave this place, there is hope!"
"Live! You must live and get revenge!"
The young Shiba constantly heard those voices while trying to stand up and flee from the Ugador Clan after the massacre.
At that time, he felt that it was his subconscious telling him to live, but after hearing the same voices once again with his current mastery of the Death Law, he knew that it wasn't his subconscious.