We are being given a taste of a dark rationalist, who does not give his enemies dramatic deaths where they get to die like heroes, perhaps accomplishing something through it.
See also Fate/zero & Kuritsugu. And note that it’s not just Hermione’s death that is fast and cruel, it’s the troll’s too: Harry steps forward with the stone, stuffs it in, releases it to explode the head, and acidifies the brains in less time than it takes to type that.
Getting caught up in style and throwing away victory is something for the lower ranks to do. Captains can’t even think about doing such a carefree thing. Don’t try to be a good guy. It doesn’t matter who owes who. From the instant they enter into a war, both sides are evil.
See also Fate/zero & Kuritsugu. And note that it’s not just Hermione’s death that is fast and cruel, it’s the troll’s too: Harry steps forward with the stone, stuffs it in, releases it to explode the head, and acidifies the brains in less time than it takes to type that.
Actually, there’s a great rationality quote for here: