×Basically: kill one construct on the east side of the room, stall the other two until the timer's right, kill the second, retreat and kill the third on the pressure plate on Turn 30. You want your sword facing SW when you do, and the other two aligned so they'll walk diagonally onto the other plates; specifically, you want the second to land right next to you so you can walk up without turning your sword.
But how do you stall them?
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×Well, if you can't figure that out, you might as well just head back the way you came.