As Kace was listening to his classmates answers and he felt guilty because he didn't think to check to see if anything was lurking around or trying to do him harm. I mean he trusted the classroom setting like so many of his other classmates and didn't think there would be an invisible force. Now he would enter an empty classroom cautiously and be more aware of his surroundings. Defense Against the Dark Arts rule number one and also common sense wise if you don't wanna be killed.
Now the headmistress wanted them to name spells that could secure their surroundings and he wondered if he should list them all? Now she wanted spells he was proficient in? He nodded and listed some off in his notebook.
He raised his hand and told the teacher,
"Professor I can do expelliarmus, diffindo, stupefy, impedimenta, protego, bombarda and locomotor mortis since I learned that spell in the dueling arena." Others ones he knew buttt he didn't know the wand incantation by heart. He would stick with the others for now.