Nextbot Attack enti?

I cant find anything to make a nextbot attack an entity,
I wound like to have a NPC to attack any player it can, until it drops dead, or if someone could point me in the right direction as far as shooting at someone or the props around them??? iv spent 4 days trying others stuff (cuz im a noob)

[editline]6th September 2013[/editline]

what is the point of having bots if they cant shoot?