JS for-loop + if-statement: перехват последнего вхождения при условном обновлении текстового узла

// Utilities
function update_NodeContent(newContent, container) {
    // Ensure that we start with an empty string
    var nodeContent_old = container.innerHTML ? container.innerHTML : '';
    container.innerHTML = nodeContent_old + newContent + " ";
}

// Content
var content = [
    "The quick, brown fox jumps over a lazy dog. DJs flock by when MTV ax quiz prog. Junk MTV quiz graced by fox whelps. Bawds jog, flick quartz, vex nymphs. Waltz, bad nymph, for quick jigs vex!",
    "Fox nymphs grab quick-jived waltz. Brick quiz whangs jumpy veldt fox. Bright vixens jump; dozy fowl quack. Quick wafting zephyrs vex bold Jim. Quick zephyrs blow, vexing daft Jim. Sex-charged fop blew my junk TV quiz.",
    "How quickly daft jumping zebras vex. Two driven jocks help fax my big quiz. Quick, Baz, get my woven flax jodhpurs! »Now fax quiz Jack!« my brave ghost pled. Five quacking zephyrs jolt my wax bed.",
    "Flummoxed by job, kvetching W. zaps Iraq. Cozy sphinx waves quart jug of bad milk. A very bad quack might jinx zippy fowls. Few quips galvanized the mock jury box. Quick brown dogs jump over the lazy fox."
]

var containerHeight = document.querySelector('#cell1').clientHeight;

function placeText() {
    if (content.length) {
        var content_words = content[0].split(" ");
        var holdContent = "";
        var useSecondContainer = false;
        var $textBlock1 = document.querySelector('#cell1 .container');
        var $textBlock2 = document.querySelector('#cell2 .container');
        var textBlockHeight = 0;
        var word = '';

        for (var i = 0; i < content_words.length; i++) {
            word = content_words[i];

            // Ensure that we have a word to display
            if (word && word.trim()) {
                textBlockHeight = $textBlock1.clientHeight;

                // If we have not already exceeded the first container
                if (textBlockHeight <= containerHeight && !useSecondContainer) {
                    // Add to first container
                    holdContent = $textBlock1.innerHTML;
                    update_NodeContent(word, $textBlock1);

                    // If we exceed the height with this addition, restore the contents to the
                    // last state and add this word to the second container
                    if ($textBlock1.clientHeight > containerHeight) {
                        // Restore last good content
                        $textBlock1.innerHTML = holdContent;

                        // Add to the second container                              
                        useSecondContainer = true;
                        update_NodeContent(word, $textBlock2);
                    }
                } else {
                    // Add to the second container
                    update_NodeContent(word, $textBlock2);
                }
            }
        }
    }
}
// Execution
placeText();

:root {
  --height_line_single: 19px;
  --height_textBlock: calc(var(--height_line_single) * 2);
}

body {
  font-size: 16px;
  line-height: 1.2;
}

p {
  margin: 0 0 1rem 0;
}

p.noMargin {
  margin: 0;
}

.article {
  width: 90vw;
}

.text-block {
  height: var(--height_textBlock);
  overflow: hidden;
  background: lightgreen;
  margin-bottom: 1rem;
}

#cell1 {
  width: calc(100%/3);
}

#cell2 {
  column-count: 3;
  column-fill: auto;
}

<div class="article">

  <div id="cell1" class="text-block">
    <div class="container">
    </div>
  </div>

  <div id="cell2" class="text-block">
    <div class="container">
    </div>
  </div>

</div>