Thomas gaped at the Slytherin kid with the black hair.. West - he liked the name but what was he talking about? Latin and roots and words.. Tom felt incredibly stupid as he sat there and listened.. while not really listening at the same time. It went straight over his head.

Back to Lafay his attention went, though he caught Addy Kennedy smiling at him and he sent one back her way. She seemed dead nice.

Noxious.. yeah. Like noxious gases. The Gryffindor boy's dorms had it's own fair share of those..

Tom raised his hand once again. "Does it make poisonous gases? One whiff an' you're on the floor. Like puts you to sleep or makes you fall unconscious. Or maybe it jus' makes a bad smell." He added as an afterthought. "Like a stinkbomb in a bottle."

Hmm.. What else?

“Could it do stuff to your mind? Me mate back 'ome had gas at the dental 'ospital once cos he was phobic an' it made him giggle like a girl."