James looked around. Three students. It seemed that some people were a little late.......... he was disappointed that Victor didn't make it, but he had already suspected the girl wouldn't be here. As such, the necessary arrangements were already in place. He had simply asked the other teachers to inform the girl that she had been poisoned, and that he had the only antidote. Possibly, she would try and cure herself in the limited time she had. If she failed, she'd be better dead for her stupidity, and if she succeeded, then that made her a valuable addition to the class. 
"People, please drink from the vials in front of you. They are frost resistance potions. You will need them for the test we are about to embark on." James sat back and patiently waited for his pupils to obey him.