The words are not found in the Masoretic text. For more on the use of dots by the Q scribes and editors see the introductory page under Use of Dots. Although this is not a technical comment it probably has its place here. Since this is narrative material describing the siege of Jerusalem by Sennacherib's armies and the same text is also found in 2 Kings 18 and 19 then it should be noted that the level of difficulty in reading has changed. Perhaps that is the reason for fewer variations found on this page, especially since evidence would seem to show that the scribe has not changed from the last page.
Some variations are simple and repeat themselves.
The names of the characters are spelled slightly differently. The KJV has both 1st and 2nd sing verbs which is not allowed by the text. NIV chooses the 2nd sing even though the M text is 1st sing. The Q text is preferred here. The Q and M texts of this verse mean substantially the same thing but the word order and content differs considerably.