Hands kinematically animated, following the animation exactly, up to when they release
Soft joints, i.e. the translate limit has a much lower strength, letting joints separate slightly as he’s getting pulled into the machine and compress slightly as he smashes into the ground
World-space guides, to align the head to an exact worldspace angle, regardless of what the rest of his body is doing. Same goes for the hand
Here’s what the underlying input controls looks like.
There’s very little new or difficult things here; the character is setup like any other character with Ragdoll today. The official beginners tutorial is still relevant here: Manikin I - Learn Ragdoll
For the feet to snap to the big capsule shape you’d use the Attach Constraint.