hehe i think he used the patrol + move cmds based with the center location distances from the zealots for each of em to be set off of along with havin hyper triggers then there wont be any faults, but pretty unrealistic if u made zealots 1 life and 0 dmg, i was thinking about making something like this but not entirely just a map like this, good job for doing it though ^_^
I saw a better version of this a while back. I think it used a bunch of burrowed zerglings that were given to p9-11 depending on which units were where. The vulture microed like crazy and was almost impossible to catch.
UndeadStar -- https://staredit.net/topic/18961/ <= wow, if there wasn't a capital letter on almost every word in the title, and a link in the signature, I may not have guesses it's an AI bot. I don't know much about map editing, but the content may even be relevant enough to be kept.