I'm sure you can use signalling (which I am not too familiar with - I refer to other signalling scripts like Schmendrick in lakerathe) - but I think you can also use the quest_global tables to achieve your goals as well. Set the NPCs to use qglobals, then make your script update (maybe a bitwise value?) and when you get to your 4-dead total, fire off the spawn of the 5th guy.
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