Guards on oremites are weird. There are tricks for dealing with them that come up occasionally. To kill a guard on oremites with nothing else around, you need to get a bit away from him and get him to come after you in a straight line either north/south or east/west while you are one tile off from being in line with him. Here is a picture of what I am talking about.
You may need to back away a bit to get him to straighten his sword. But if you do this, you can let him come to you then just move to stab him.
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