Thanks for your answer FrankieV. The problem is that the rigs are totally different and retargeting won’t work. It’s a biped with normal joints and a rig with just joints for the back pack. They both have an blendspace that include run,walk,idle, left and right animation for each rig (biped and backpack). I also have a character blueprint made from the biped that includes the back pack. I have two variables for both blendspace (speed and direction). Now, I want animation to play at the same time. Maybe, the biped animation gets sends it to the back pack animation. Something like casting or linking the blueprints with an interface? Could it be just the speed and direction variables drive the animation?