Can you win the game on your opponent's turn, and does the 'score both battlefronts' rule still apply in that scenario?

Ruling: Yes, it is possible to win the game on your opponent's turn, and the requirement to score both battlefronts still applies.

Sequence:

• Opponent attacks and you lose control of battlefront A
• Opponent attacks battlefront B
• During showdown at B, you use Ride The Wind to move a unit to A and conquer it
• You also use Ride The Wind to move a unit to B and conquer/defend it
• You win by controlling both battlefronts on opponent's turn

Nuances:

• This strategy is commonly used by Annie decks
• Yasuo, Windrider can also achieve this by moving 3 times on opponent's turn when at 7 points