[quote=@BlackSam3091]
Cheers guys. Seeing you all speak about games I've never heard of, I can honestly say that I've never felt like less of a nerd in my life. 
[/quote]

I know a fair amount of under appreciated games. If you like horror type of games and don't mind playing one from 2005, I'd recommend Call of Cthulhu: Dark Corners of the Earth. One of the few things that does Lovecraftian horror right. You can get it on steam for $4.99.
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[@Lord Wraith] Looks good, trying to get a few ideas on what to do. 

A town plunged in darkness usually means an increase in crime, not to mention it would help Gavin remain hidden and allow him to observe the area unsolicited as he formulates a plan. 

A relativly small crime organization getting their hands on some serious munitions (and by mentally immature teens no less) would be disastrous for the populace. Gavin would need to take care to avoid fatally injuring someone, especially considering having a gun aimed at you is not a pleasant experience.

And lastly, Vampire or guy trying to misdirect the blame? Vampire makes the most sense but, does that make other fantastical beasts such as werewolves a possibility? Probably not vampire, insufficient evidence to conclude with any amount of certainty. Need more information to conclusively answer. What about man? Is it possible to drain victims of blood using readily available methods? If then, what use would one have for blood if not for sustenance. Some individuals believe drinking blood from young adults/teens can extend ones lifespan, perhaps this individual thinks the same. Would require all victims to be before a certain age, or at least look young. Otherwise need to discard theory. Alternate possibility- for the fun of it. Individual's sanity may be questionable, a reason for the deed could be artificially crafted and appear reasonable to someone who loses logic. Theory possible, unlikely however. Again insufficient evidence. Conclusion- unable to determine likely culprit. likely to be a human (not vampire) for reasons unknown.