"This town happens to have an unusually high concentration of demonic energy," she says. "We call it the Hellmouth. It's a much more accurate name than Sunnydale, but for some reason we haven't been able to convince the town council to paint "Hellmouth" on the cheerful welcome sign. Anyway, it's helpful to have undercover Watchers here, as it's a good place for a Slayer to set up her home base."

(She seems to have recovered her composure. Being able to snap into Teacher Mode probably helped).