Carl tried to smile. "It's okay, Azura!" It was totally not okay that he was stuck to the floor, but there was no need for her to apologize. After all, attacking and getting hit was the whole point of a duel. Speaking of which, that was a strong Stickfast Hex. He could not move his feet despite some frantic tries.
Aaand his spell had hit her! He had meant to disarm her and nothing more, but it seemed to have the opposite effect. He hoped she was okay ... he did not want to hurt his opponent, even if it was a duel.
The Hufflepuff was well prepared to defend himself against the next spell. "Protego!" He shouted and a shield appeared, this time deflecting the spell back. Rictusempra, hmm ... imagine what would have happened it he was hit by that. Being tickled and unable to move. It would have been torture.