He did not expect the Hogwarts students to pick up on the subtle from above, but it brought a slight smirk to the professor's face. They would be descending upon them all soon and with ample time for these students to administer the spell to themselves. Or to each other as the case seemed to be more than not. It was only to be expected, especially from the first years who were still learning to master even the simplest of wand movements. No insult nor snark intended by this thought, mind you. That being said, he was still presently surprised that there were students who were picking it up so quickly. Naturally gifted with defensive spellwork, he supposed.

And he would consider this his victory, Mademoiselle Blaze. Arguing in his class would have only detracted from everyone's learning and earned you yet another detention with him.

There was also relief that the Hogwarts prefect was, finally, able to pull herself together. The disappointment vanished, somewhat, from his brow at the sight of her assisting Mademoiselle James, but the man was still concerned. Though he did suppose he could not blame her for being a bit emotionally unstable, it being her OWL year and being relocated to an entirely different environment for it was not conductive to low levels of stress.

"Outstahndeeng efforts," he praised as he slowly weaved his way around the students. "Try not to loose sight of your wand when it slips from your greep." Though he was confident he could find anyone's wand that went a bit rogue. Even if it were accidentally claimed by a rose bush and hidden within its thorns. "If you are uncertain as to whethair or not you have cast ze spell correctly, a simply way of checkeeng is to try and peench yourself. If you are able to touch your skin or cause any sort of peencheeng pain, you will need to recast. In such instances, I do not recommend zat you layair spell upon spell, but remove your failed attempt with Finite." He continued to move about students, offering advice and sometimes physically moving a student's hand on their wand to show them a better means of gripping it. "Mademoiselle Grantham, I can assi----"

But before he could finish his offer to the mademoiselle, his headmistress appeared in the garden in a fury. He supposed he should have informed her sooner of his change of plans with location, but the scent of her roses helped to placate this evening's creature companions.

"We are having class, Headmistress," he explained coolly, his arm instantly moving around to the small of his back to bow politely at the waist towards the woman. "It is pertinent and crucial, for ze safety of zese students, zat class be held here ziss evening. I assure you personally, Headmistress, zat no harm will came to..."

Wand hand across his chest, over his heart in a display of sincerity, Mathys soon found himself choking on his next words as a rose bush went up in flames right beside himself and his headmistress.

Sacré bleu.