"The key words there, my friend, are 'in the hands of a Dragonslayer'. Most Dragonslayers, myself included, rely on massive weapons that can bludgeon a dragon to death or pound their way through the scales. No offense, but a normal human couldn't even lift them. As for there being many different types of dragons, you're right about that. I'd think a small dragon could certainly be slain by a town guard swarming it and hacking the beast to death, but the casualty numbers would be immense. Better to stay well clear of it and hit it from a distance. With luck, you'll strike an artery and let the thing bleed into oblivion. Even if that doesn't happen, you only have to worry about the breath attacks, not the teeth, claws, and tail."