You should go back now and try to accomplish this.
×how do you get them in the right positions - the bombs are in the way, right?
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×What are those mirrors for?
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×Yep, move the mirrors to block off some of the paths so that you can activate entrances from different horns
Ok, but that's still not working, right?
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×why are there four horns but you only need three helpers?
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×There's one more way to delay the north east helper
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×if he had to move just one square more...
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×what if he cam in on the western of the two squares instead of the east?
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×you need to use the 4th horn to summon a fourth helper who will kill the first helper in east square of the NE entrance