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It didn't work.
I added the animation from happy, and tried another one, and it turns out like this:
That is, immediately after death, the animation of the killed skeletons remains, but in fact, they are resurrected - they are on the battlefield, and their number is restored. After they move away (as in the example with the warrior skeletons), the animation is basically fine, but sometimes (not always) it glitches when you hover the cursor over them.