halo ce movie making

[inkjet]

ok so my two friends and i want to make a movie but only have two computers. i have noticed how in the red vs blue movies they have used a separate person to be the camera and then crop out the hud. however since we don't have a third computer for someone to be the camera we need to use the cameras available in devmode. we have seen in the movie that the halomods team made using hek that there can be multiple people and still have a 3rd person camera. does anyone know how to do this? as far as i know you can't join lan games with devmode on so i don't see how you could do this. please help.