Discovered a few tidbits and figured they were noteworthy
Empty Night- is a vampirology curse used to refer to bad hunting/no humans/prey an empty night for them. Considering WCV are known for this curse...
Little but fierce is a quote from Shakespeare's Midsommers Night (which connects Murphy to Fairies fyi, here's lookin at you raidem)
"game over" was used before SG, when Harry knows Billy is waiting to take out Cowl in DB.