Bella shouted , shielding a hand over her eyes as she watched the ball bounce out of sight . Renee punched a fist in the air and shouted happily . But Bella was barely listening . She was watching the instructor , only a few years older than her mere fourteen years , prepare for another serve .

Question: Why did Renee punch a fist in the air and shout happily ?
Renee punched a fist in the air and shouted happily because she managed to score against the instructor .