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1,2: any played ability must complete in full (except if it's removing your last character in battle) before any other abilities can activate. If you aren't still winning the battle, you would now have initiative to play. The target of the negate is the card you are negating, not the target of the negated card. So it's whole ability is negated regardless of what it is targeting. When the rules say "targeted card or card type", means when you play it, the target's special ability is negated. The target is specified in this case, and is the last good enhancement played that battle.3: When a card is negated, all abilities in it are negated. Specific abilities can be negated as well, but unless it refers to an ability, it's all of them. So in this case, got would put the card back as well.Side note for 3, you can not play another "negate the last enhancement, even though it would effectively negate the ability removing you from battle. The reason is that special initiative lets you play a card that negates or interrupts the ability removing you from battle. Since the enhancement wouldn't be negating that card, you cannot play it.