I dont think they crashed you server the same way they do mostly, ours is moh i yours is spearhead i guess, but just in case u wanna protect yourself against ppl spawning shit in your server and tryin crash it and or cause major lag, u can go here
http://www.mohadmin.com/nuke/modules.ph ... load&cid=2 , and scroll down a bit and youll find it. It also has a whole shitload of cool other things there that may help ya out as well.