The SSS dummy should explode and kill the player if they fail to defeat it in time.

[Kallera]

Nah not an explosion, might as well go to the real thing for that.. If I had to put in something, it would be your character leaning against the dummy, exhausted, perhaps with a dialog box with some stats a la the bonus screnlen in diadem. With how many times certain dots wore off or how many combos were broken, stuff to help point out where to refine your technique. which would get skipped if you just decided to leave before the timer ended.