Animation Blending 2 Keyframe question

One of the creators of the game Overgrowth explained how he did his animation pipeline during a GDC, I watched it here:

I really would love to replicate what he did, however I am not sure how he was able to manipulate the blending like how he shows. Does anyone
have any insight how to do this? Thanks :slight_smile:

Iā€™m pretty curious on how this is done, if anyone has insight, please let me know. Thanks :slight_smile: