Enemy attacking after hp hits zero

Hello everyone!
I was wondering if I was the only one this happens to or if it’s the way the game is programmed. Wheter in war, cups or event sometimes an enemy would be hit by combos, filling it’s Mana to full, but also dropping it’s hp to zero. Afterwards it will do it’s move and then die. Is it normal?

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Got hit with damage over time maybe? Or Counter attack?