Challenge: cold
Word Count: 100
"The Head Boy himself offered our students space, and you turned him down?" Severus automatically cast a muffliato to prevent eavesdropping, not letting himself think about how easily the old spell came to find. "Do you really want half your housemates to become ill?"
"But sir, they're Gryffindors!" gasped the sixth year prefect. She was an earnest little thing, with pure blood and minimal magic, and very conscious of her family's social standing. "We - we - "
"Give it up, Demetra," said the seventh year boy. "Hating Gryffindors is one thing, but we're half frozen. Professor Snape is right."