I managed to enable Russell's warcry from his boss mission in freeroam.
He only screams when he performs the running headbutt, the berserk grapple, the chest counter, the power bomb, the boston crab and when he taunts. Each attack has a different type of warcry that doesn't affect the attack performance.
I also show you an unused strafe that he was supposed to perform at one point of his boss fight but was disabled for unkown reasons. The animation is kinda buggy but it's completely controlable.
These features (and other ones) will be part of my next version of "Not another selector".
Bully SE: Russell warcry and unused strafeSpecial thanks to DaBoss for providing me some resources.