Brains consider force arrows to be obstacles. As long as there is a direct path from monster to Beethro, a brain will not direct any monster onto a force arrow.
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×That means you need to keep that central pressure plate depressed (either with Beethro or with roaches) pretty much all the time until the rattlesnake comes out.
Tips on fighting brained monsters:
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×When fighting brained roaches, it is easier to hold your ground if you kill by moving rather than sword swinging. Of course some sword swinging is necessary, as you will need to turn around and fight roaches from different directions.
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×When fighting the brained rattlesnake, you give yourself a chance to cut it every time you make it turn. Try leading it in many S shapes.