Closest vertical Point

Good day, is there a command that pulls a line to a closest point vertically?
(almost similar to a closest point command)

GH 01.gh (13.4 KB) Rhino 02.3dm (468.9 KB)

Thanks a lot!

If the point is in same plane as curve, just draw Line SDL in Z direction, do a Curve|Line interscection and you will get a point.