I don't understand why you want to use 2 entities for your ai-functions? You can also split up your ai into many functions.

An simple example:
Code:

function ai_loop 
{
  while (1)
  {
    ai_think(); //This function retrieves information about the entities environment
    ai_act(); //Here the entity realy moves, shoots...
    wait(1);
  } 
}


ai_think sets variables like what_to_do_next... as soon as ai_act is ready with its current action (like shooting), it starts with the work specified in what_to_do_next...

MfG, Christian__A. Visit my Site: www.chris-a.de