Every one that I could see was destroyed, and I personally destroyed them so I'm sure one didn't slip out somehow, and I looked everywhere just in case one was resurrected. Maybe one wasn't registered as killed somehow. I thought this was a repeatable problem, which is why I reported it, but a player has since informed me they were able to clear the event successfully, so please just ignore my comment. I'll just assume it was a fluke and enjoy having your plugin running on my server.
While I have you, I want to compliment you on your AI. I'm not sure what you're doing differently to generate NPCs that actually hunt down players, but I love it! Any chance there will be more plugins like this? I'm thinking the possibility of a hook to the attack heli event, where a configurable number of your buffed up NPCs stream out of it to attack the one who brought down the heli.