Damn, I discovered that the Inferno units have the same problem with the joy animation. But there seems to be an idea on how to solve it, it should work out.
Psatha, will you read this, maybe you know how to solve this problem? So, there are bones called Hip and Hero_Spine on the back. Where should I cut? I've figured out how to find the joints precisely. The only part of the body that doesn't behave as I like during animations is...(((
Roman, this is a nuance in the bone weights assigned to the donor model's mesh... when using the effects method, the only thing you can do is replace the problematic meshes for certain animations, or add an additional mesh to such an animation, i.e., for the happy animation of the Inferno units, you need another connecting mesh, but it should be of a tricky shape... for the back, something like a double-sided cone (or rather, in the shape of a dried plum) to cover the gap when the two parts diverge relative to the Hip and Hero_Spine bones :smile13:

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1