Guards use brain pathfinding, and like brains, they get confused by force arrows, so they treat them as impassable when working out which way to go.
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×You want them to make an unbrained move - to do that you'll need to block all the squares that are the same distance to you or closer.
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×Stand next to the corners of the room with your sword diagonally.
ummm. like this:
######
#./...
#B#v#.
#.>#<.
#.#^#.
When the guard hits your sword, he won't want to go backwards or stay still, so he'll step onto the arrow.
