[PerihelionCT]

it "bounces lower" in that a ball coming down will dive down faster and lower. But after it hits the ground, it will "bounce higher". The misunderstanding probably comes from using the word "bounce" without specifying whether the ball is bouncing up or down. This is the forward topspin of the ball working to move the ball harder in the direction it's going (I. e. faster down before bouncing, and faster up after bouncing)