Index: src/wp-includes/css/admin-bar.css
===================================================================
--- src/wp-includes/css/admin-bar.css	(revision 32819)
+++ src/wp-includes/css/admin-bar.css	(working copy)
@@ -207,17 +207,17 @@
 	right: 100%;
 }
 
-#wpadminbar .ab-top-menu > li > .ab-item:focus,
+#wpadminbar:not(.mobile) .ab-top-menu > li > .ab-item:focus,
 #wpadminbar.nojq .quicklinks .ab-top-menu > li > .ab-item:focus,
-#wpadminbar .ab-top-menu > li:hover > .ab-item,
+#wpadminbar:not(.mobile) .ab-top-menu > li:hover > .ab-item,
 #wpadminbar .ab-top-menu > li.hover > .ab-item {
 	background: #32373c;
 	color: #00b9eb;
 }
 
-#wpadminbar > #wp-toolbar li:hover span.ab-label,
+#wpadminbar:not(.mobile) > #wp-toolbar li:hover span.ab-label,
 #wpadminbar > #wp-toolbar li.hover span.ab-label,
-#wpadminbar > #wp-toolbar a:focus span.ab-label {
+#wpadminbar:not(.mobile) > #wp-toolbar a:focus span.ab-label {
 	color: #00b9eb;
 }
 
Index: src/wp-includes/js/admin-bar.js
===================================================================
--- src/wp-includes/js/admin-bar.js	(revision 32819)
+++ src/wp-includes/js/admin-bar.js	(working copy)
@@ -28,6 +28,12 @@
 					e.stopPropagation();
 					e.preventDefault();
 					el.addClass('hover');
+				} else if ( ! $( e.target ).closest( 'div' ).hasClass( 'ab-sub-wrapper' ) ) {
+					// We're dealing with an already-touch-opened menu genericon (we know el.hasClass('hover')),
+					// so close it and prevent propag and defaults. See #29906
+					e.stopPropagation();
+					e.preventDefault();
+					el.removeClass('hover');
 				}
 
 				if ( unbind ) {