Theo watched with interest as Snape studied the box and tried - but failed - to catch the spells Snape was using. He was slightly unsure on his teacher's conclusion; if he was going to take someone down with a puzzlebox he'd have certainly hid the dangerous within the mundane.
He wasn't about to argue with Snape though.
"Sit." He said noncommitally to that comment. "I suppose I should try and solve it?" he asked, watching his professor for guidance, his common sense warring with his curiosity.