I wasn't having too much luck with the reaction manager. Im sure its something I'm overlooking. Possibly dealing with trying to hook into a biped arm. I guess because of what Rick is saying. The nodes? are hidden. Maybe I needed to make the master the Expose Transform Helper for it. Anyhow, taking ideas from both. I got it…
You need to use the wireparameters to take 50% of the X axis, but since you are using biped you need to use Expose Transform nodes. Yes, it's a pain. ET nodes basically query the bone and report back on what it's doing. So, you can't access rotations directly, you need to set up an etn for everything you want to look at.…