This brawl is messed up in so many ways...
First of all, you roll the SAME BAKUGAN to determine who sets the gate card. And you only roll once, unless it's a tie-breaker. Look up the Bakugan Handbook in BAKUGAN INFORMATION. You'll find more rules there.
Next, the round isn't over until both players have exhausted all possible actions, or both agree to end the round early.