Katherine Jenkins and Mark Ballas (Adam Taylor/ABC)

A potential season-ending injury, of course.

Monday night’s performance show ended with a bit of a cliffhanger, as Tom Bergeron promised that the classical singer Katherine Jenkins would receieve medical attention after she hurt her back during her last performance. Katherine and her dance partner, Mark Ballas, were shimmying through a samba when at the very end, Katherine appeared to trip, unable to finish the last dance move.

The judges were sympathetic as Katherine buried her head in her hands, telling Mark, “I’m sorry, I’m sorry,” over and over. She told co-host Brooke Burke Charvet something happened to her back.

Later Monday night, Katherine tweeted, “Thank you for all your concerned tweets... I'm with the Doctor, he says it was a reflectorical spasm in my lower back.”

And on Tuesday morning, she appeared to have a positive development: The good news is that I'm feeling better, just a little sore,” she tweeted.

Should Katherine make it through Tuesday’s results show, she’ll have about a week to rest up and get ready for Monday night. And, ABC would hope, lots of concerned viewers to see if she’ll be able to perform.

Mark Ballas told E! last night during a backstage interview that he feels like she’ll be okay:

“The good thing is that there is no bone damage, thank God, and hopefully there's no muscle or ligament damage. I just know from suffering past injuries that when you're done, you're done,” Ballas said. “...But she was up moving around so hopefully she'll be fine.”