I invented this challenge
There are a couple of different ways, but my original method was to go east (to about column 12) then all the way north, then south and go around the gentryii chains so they get tangled up on themselves (basically, an expansion on the idea you used in EoA 2N). The western eyes are easy to kill. Then go east and onto the sandy ground, wait for the gentryii to approach you, then go south so their heads are stuck behind their own chains again.
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50th Skywatcher