They turned around quickly pretending not to notice the commotion, Draco could hear Granger apologising over and over for her curse. "Oh Neville, I'm so sorry, I’ve never succeeded in non verbal spells before. I didn't think it would actually work, I was -" She interrupted her rambling to halt the dancing jinx,  "finite incantatum!" She continued. "I wasn’t really paying attention to the spells I was using - I-I just started firing any that came to mind."