וּמִכַּ֤ף מֶֽלֶךְ־אַשּׁוּר֙ אַצִּ֣ילְךָ֔ וְאֵ֖ת הָעִ֣יר הַזֹּ֑את וְגַנּוֹתִ֖י עַל־הָעִ֥יר הַזֹּֽאת׃
At ililigtas Ko ikaw at ang lungsod na ito mula sa kamay ng hari ng Asiria, at ipagtatanggol Ko ang lungsod na ito.
Rashi
And from the hand of the king of Assyria will I save you We deduce that he became ill before the downfall of Sennacherib.