4 bipeds spawn in corners, scripts hurtle them at you and make them spray plasma out of their bodies. forgot what the respawn time is, I'd say either 30 or 60 seconds after they die till they respawn since I cant think of it off the top of my head. Works fine with friends.
There is also some app somewhere to enable AI on one specific map, but I cant remember where. Think it was the original halomods before it went down and was revived, but cant be sure. check the current one, modacity, and monstrmoose. those are the only other sites with H2V stuff that I visit, so it would have to be one of them (or the old halomods)
I have one other with warthogs, but im to lazy to try and remember my mediafire password, its set to autologin on my home PC and thats all I need lol.