Sam nods, keeping his eyes on the barrier as LeBlanc gives him instructions. Hold the smoke. Alright. Release it - okay - and relight the flame. O-wait. What?

Sam falters at that and closes up the barrier again. Looking now he raises his brows at the other mage. Alright that was new. "So this is a practice of... using two elements at once... or switching them in the blink of an eye?"