Thief of essence & Take captive

By joecana, in Warhammer Invasion Rules Questions

Newbie question for below 2 cards:

Thief of essence

Action: When one or more units leaves play, draw a card.

Q1 Even when opponent's units leaves play, I could draw a card? (I assume yes)

Take captive

Action: Take control of target attacking unit until the end of the turn. Move it to the attacked zone, declared as a defender.

Q1. If I take control of Swarm of bats as defender, after battle, will it go to my discard pile?

Q2. If I take control of Doombull as defender

(Action: When this unit leaves play, deal 4 damage to target unit in any corresponding zone.)

After battle, it dies.

Could I activate its ability to deal 4 damages? Or my opponent will activate this?

Declar as attacker

Q1. Could I declare a unit as attacker if it did not contain hammer icon, or due to some reasons, it's hammer icons were eliminated

Thank you so much.

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