Agh! The scroll for completing the Response to Precious courage challenge has expired.  Without realising there would be a scroll drop form the Kzarka challenge for the season character to open and use, I stupidly did not notice it in my main's inventory until it was too late.

Is there a way to re-do this or am I out of luck here?

Please advise if you know!

Just kill the relevant boss again. You will get the response to precious courage again.

Thanks very much, Altos!  I was about ready to cry as it's not always easy to scheduule my real life to accomodate boss challenges. Thanks again!