What it says in the title.
Dart thrower is the motion of throwing a dart, it’s neither knocking on a door nor deviating the wrist from side to side but almost a diagonal between the two.
The motion that produces a diagonal perpendicular to this is reverse dart thrower, you might like to call it 'flicking sticky shit off your little finger motion".
Prepared to delete this when someone explains it better.
There’s a section of the Pickslanting Primer that explains this really well: Chapter 1 – Identifying Wrist Motion – Cracking the Code
It has to do with which axis the wrist moves along during picking. A DART player’s motion is mostly flex/extension, as if throwing a dart away from you. An RDT player’s motion is mostly ulnar/radial deviation. The DART and RDT axes aren’t quite perpendicular but they are pretty far from each other.
You can also tell a DART player from an RDT player by which direction their picking hand palm faces.
For an RDT player, the palm faces the headstock, and the pinky side of the palm often touches the strings.
For a DART player, the palm faces the bridge and the thumb side of the palm may touch the strings.
Yes, RDT is (sort of) perpendicular to dart motion, not mirrored. That’s what was throwing me off.
Thanks.