Now art thou what thou art

"Ah," Claudius says, as lightly as one can be when it comes to the topic of youths killing each other. "The boy who fences by the book. I didn't realize his unspired swordsmanship had been fatal." That's a lie. Claudius guessed it, easily enough -- but it had been a sad thought, and those floated away easily under the influence of the tincture he'd taken.