As you might have guessed, you need the guard to strike the orb twice.
×There's a small trick just at the end that you have to get right.
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×You can still clear it from the point where you stand just above the orb, (the roach is two steps E from you behind the wall, and the guard stands two steps N from you, with his sword pointing towards you).
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×Instead of moving SE, SE, S, S, to the tunnel, move SE, S, SE, S. To make the guard hit the orb.
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×Then comes the evil trick.
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×Move N, S, to get the guard to turn his sword, then move S to make him hit the orb again.
is my very own DROD-like game. Please check it out!