Liye's incarnation had the power to attack with his full power once, but if he used that energy to save Shiba's life from an attack, he wouldn't have any energy to kill the Law Masters.
After all, he was just an incarnation he left with Shiba before going to reincarnate, so there was no way Liye could supply him with strength.
Moreover, he set the rule of only being able to act at the last moment, so he had to wait until Shiba was unable to do anything else before acting.
However, once he acted, there was no way those Law Masters could survive.
In fact, Liye needed only a single word to kill them all.
His understanding of the soul was more profound than that of older experts that reached far higher levels. It wasn't a balanced understanding, but he was still able to create things like systems to be added to a soul, which definitely wasn't something that could be done just because of mastering the Death Law or the Death Essence.
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