Cool glitch (that i don't need help for, nor is it game-affecting)

[Ryastar]

Right, so, i was winding towards the end of a battle, there is a stack of 15 vampires and some other stack. It is my giants' turn. I order them to use earthquake. They kill the stack of vampires, however, the stack of vamps remain, with a zero where it says the numbers of troops in the stack. IT is their turn next, and they regenerate to full health (still zero of them) they then turn into bats and attadck my giants, ressurecting one of themselves, meaning there is now a stack of 1 vampire bat.

I have no idea how that happened, but it was frickin cool