How can I use the Knife tool to create a line between two vertices?
When I try to use it, the tool simply deselects my first vertex.
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If I read this correctly, you don't really need the knife for this, you can just select the 2 verts and press j. This also works with verts separated across longer distances. The join (j) line will cut a vert into every edge it crosses in a straight line between the selected verts.