Something like this should get you looking in the right direction.
<?php if ( have_posts() ) : while ( $fullbanner->have_posts() ) : $fullbanner->the_post(); ?>
<?php $banners = get_field(‘home_banner_01_selection’); ?>
<?php if( $banners ): ?>
<?php shuffle($banners); ?>
<?php foreach(array_slice($banners, 0, 1) as $banner ): ?>
<?php the_field( 'home_headline', $banner->ID ); ?>
<?php endforeach; ?>
<?php endif; ?>
<?php endif; ?>
