Extrusion along path using Geometry module

I am trying to build a wall cross-section by extruding a line along a 3D wire path. I need the thickness of the cross-section to be constant, (the length of the line). It is my understanding that the original line should maintain a constant angle with the tangent of the wire, but the far end of the extrusion has the same angle as the original line. See photo below. Can someone tell me what I am doing wrong? I am using Salome 9.11.