Sam watches with interest to see what kind of lesson this is going to be. At seeing the flame he's half expecting that the other mage is going to ask him to copy her. She doesn't.

Put a barrier around the flame? Well that he's been practicing on.

For a moment he shifts around to get more comfortable, suddenly feeling nervous. He's done this hundreds of times, but with knowing he's being tested? He doesn't feel like Lady LeBlanc will be harsh on him nor judgmental, but it's been a while since he's felt the need to impress a mentor.

Raising a hand, his fingers spread wide, he concentrates on the flame. He sighs. The flame flickers for a moment as the air shifts around it, a faint blue sphere forming. The flame dances as it uses up the rest of the air in the sphere before disappearing into smoke.