Sirius chuckled. "It's not so specific once you get the general principles down. Then you can apply it to anything. Most people don't get as far as to turn people into glassware but eh." He gave Hiccup a cocky smile. "I can manage it. You'd be surprised how useful that is. Wouldn't you like to shatter your worst enemy once or twice instead of pickling them? You haven't lived until you've tried it." He winked.