>>375670874
I figured out the arm movement thing, the illusion is indeed enhanced a bit:

https://streamable.com/grehr3 

For reasons I don't understand, animating humanoid arms doesn't work on the Gesture layer. I moved them to the Base layer, and I guess that good enough. Now the trouble is making more convincing animations. I don't think you can animate the hand IK target itself unfortunately, and unity makes editing humanoid animations extremely painful, so it'll take some doing.