Trim Rebar by Perpendicular method

Trim Rebar by perpendicular does not seem to trim. I have tried using several points perpendicular to the line I want to cut, but it does not cut. I also find this misleading as a point perpendicular to the bar doesn't make sense, but should be along a point parallel to the bar. The other two methods line, and points are based on drawing a line perpendicular across the bar. Am I missing something?