JoJo Siwa didn't let a mid-dance injury ruin her performance! ET's Matt Cohen spoke to the 18-year-old contestant and her partner, Jenna Johnson, after their performances on Monday's episode of , and Siwa detailed how she pushed through during her Salsa to Janet Jackson's «Feedback.»«Doing that dance, I was just living in the moment. Then all of the sudden, halfway through, I got the worst feeling in my neck.