First troop there, but not there

What you were expecting to happen, and what actually happened?
First troop, Nobend brothers, stayed alive with 1 hp, but in next turn didn’t do skull damage, instead, my second troop did react and did do damage, while first was standing still. Secondly, in next turns, the first troop couldn’t collect mana, and it was like it wasn’t there.
What are the steps to make it happen again?
Don’t know.
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