Edit in JSFiddle

$('#fullpage').fullpage({
    sectionsColor: ['yellow', 'orange', '#C0C0C0', '#ADD8E6'],
    hybrid:true,
    fitToSection: false,
    afterLoad: function(anchorLink, index){
                var loadedSection = $(this);
               
                if(loadedSection.attr("id")   == "four") {
                    $.fn.fullpage.setAutoScrolling(false);
                }
                if(loadedSection.attr("id")   == "three") {
                    $.fn.fullpage.setAutoScrolling(true);
                }
                
                
            },
});

<div id="fullpage">
    <div class="section">One</div>
    <div class="section">Two</div>
    <div id="three" class="section">Three</div>
    <div id="four" class="section fp-normal-height fp-normal-scroll">
      <div style="height:1000px;">Four</div>
    </div>
</div>
<footer style="height:300px;">Site footer</footer>

.section {
    text-align:center;
}