BuddyPress.org

if ( jq(this).hasClass('no-ajax') )
    return;

Without looking at buddypress.js, I’m 99.63% sure this tells the script to return (stop executing the function) if a particular page element has class ‘no-ajax’. If the purpose of the function is just to add transition effects then you could add the no-ajax class to the page element to stop the transition effects from happening.