This chapter is... pretty annoying with the exit/reenter trick, but you gotta do what you gotta do to get min kills. As an interesting side note, you can keep repeating the door trick with successive red zealots and accumulate a huge pile of keys by the door downstairs, lol. You can grab them all, too (not sure if they stay in your inventory the entire game, though). That's probably going in the next installment of The Weird and Wonderful if I ever get around to it.
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