Pfft. Forget about it. I’ve changed the whole logic. I added blend bones in the Default state in the AnimGraph and linked them to bones and functions like equip weapon:
Event graph:
Can’t say this topic was solved, because I had to change the code, starting from the scratch to have things working properly. But, that’s it, buddies. Calculate Direction node in new versions didn’t work for me.
See you in my next post when I open my WIP thread 
Thanks!