To kill the first four (Behind the force arrows),
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×Try killing one group before starting on the next. Is there some way you could move closer to one group? (Hint: move diagonally so that a wall is to your right). What sword orientation would you need to protect yourself from the roaches? If you can get closer, how would you kill the pair before the next group arrives? (Note that you have only three moves before the roaches get you.) Try stepping to kill the second roach so you have time to rotate.
For the other two,
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×Try stepping diagonally to kill one and hide behind the wall before rotating to kill the other.
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Resident Medic/Mycologist