Generally, there are many amusing bugs related to splitting. The other day, Neo told me about a situation: a hero dies from skeletons, and then when trying to kill the skeletons, a battle starts with that hero. The thing is that after the hero's death, his "shadow" remains, and another hero "steps" on it when attacking the skeletons. I don't know if he saw this in SoD or ToE.
As for the skeleton, I'm not sure. There was no splitting. There were only skeletons in the garrison. Mike, Dust, and Alessandro on the other side could see it better; let them tell the story.