Here, you need to learn about one type of goblin manipulation while in a 2 square wide corridor.
Goblins are afraid of your sword, but they may be forced to move right next to it if they have no other square to go to. With a group of them, you can exploit this in a narrow place, where goblins nearest to you cannot flee from you because goblins behind are blocking the way, so they have to move towards you instead.
For this particular scenario...
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×...after hitting the orb facing east, rotate to face west, and deal with any roaches that attack by rotating (but don't move). Now rotate clockwise to face north. Rotate twice anticlockwise to face west, and then twice more clockwise to face north. Repeat this procedure several times. What do you notice about the way the goblins move?
Why do the goblins do this, and how could you kill the one closest to you?
As I mentioned above, you should be able to clear out all but 2 goblins and one roach using this method.
Does this help you understand the problem?
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Resident Medic/Mycologist