Fix a typo; add a suggestion about hard refreshing a broken game

index.html

@@ -151,6 +151,7 @@
         <h1>oops!</h1>
         <p>Sorry, the game was unable to load at all.</p>
         <p>If you have JavaScript partly or wholly blocked, I salute you!  ...but this is an interactive game and cannot work without it.</p>
+        <p>If not, it's possible that the game updated, but you have a mix of old and new code.  Try a hard refresh (Ctrl-Shift-R).</p>
         <p class="-with-error">I did manage to capture this error, which you might be able to <a href="https://github.com/eevee/lexys-labyrinth/issues/new">report somewhere</a>:</p>
         <pre class="-with-error stack-trace"></pre>
     </main>

js/main.js

@@ -974,7 +974,7 @@ class Player extends PrimaryView {
         // Auto-delete captions once their animations end
         this.captions_el.addEventListener('animationend', ev => {
             if (ev.target !== this.captions_el) {
-                this.target.remove();
+                ev.target.remove();
             }
         });