Literary: Nephi incorporates specific verses from Isaiah. Unlike his usage of Isaiah where Isaiah was the base text, here Isaiah is included as an integral part of the text. As we have seen in other occasions, this continues to be a literary use if Isaiah rather than as a base for a theological argument.
The text cited is Isaiah 11:4:
4 But with righteousness shall he judge the poor, and reprove with equity for the meek of the earth: and he shall smite the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked.
There is no significant alteration in the text. Nevertheless, verse 30 is an intercalated mini-commentary on Isaiah 11:4.