"I know how to shoot a crossbow," Arthur said, idly, "And a shotgun." For, er, obvious reasons. "If it hadn't, we'd have had to get more aggressive, slice a clear line down to the causeway or even the sea, find some ships or build rafts and leave the island," he noted, "Or lured them into the school, and set fire to that. Sinew alone wouldn't kill those things."

Not that Arthur had gone over this over and over and over again in his mind, or anything.