Using RegisterMovementComponent node

How can I use RegisterMovementComponent node to set AvoidanceWeight dynamically in a Pawn blueprint?

I realize I should be using Cast To AvoidanceManager to get the reference for it, but nothing I attach to that node seems to work. What is the proper hierarchy to use this node, because everything I try fails.

Barring that,how can a Pawn adjust its own AvoidanceWeight during the game?