Should Partial Charge fail, you could try spawning a Beacon object for the AI to target and approach (or perhaps Flank if Approach uses up ALL movement). I've done a similar thing in the Moathouse with the Guardsmen to make them wake each other up. However, be aware that past a certain range, the AI may simply fail to be activated at all. I've run in to that problem with Lareth, for instance - if the party were too far away (in the corridor), he would simply skip his turn without executing any move command. I say 'may' because there are instances where the AI does seem to work at range, so this may be some hardcoded per-map behavior.