Eini could feel the aura of five different Laws surrounding Shiba. She didn't know what kind of cheat Shiba used to become so strong in such a short time, but she was glad that Shiba turned so strong.
As for what happened to her death that was nullified, she already knew that Shiba could do that thanks to the legacy he received from his master.
The truth was that Shiba alone wouldn't have been able to save her since he couldn't use that skill of the system at will.
However, while he was meditating, he suddenly felt that Eini was in danger and managed to use the remaining power of time that had been altering the flow of time to cover the whole planet with Absolute Protection just before Eini was killed.
Then, he used the last bit of energy remaining in that space to teleport directly to Eini's side.
Shiba hadn't finished training. He hadn't reached a point that he couldn't progress anymore due to a bottleneck.
However, he gave up the chance of improving further to save Eini.