In order to win the Big Hand Jackpot, you must satisfy the following requirements:
1. Contribute at least 15 Big Blinds to the pot before making the jackpot hand.
2. Use two hole cards to make the jackpot hand.
3. Use a pocket pair to make a Four of a Kind jackpot hand.
As long as you have satisfied the conditions, you will hit the jackpot regardless of who wins the hand and even if you decide to fold.